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diff --git a/vendor/Parsedown/LICENSE.txt b/vendor/Parsedown/LICENSE.txt
deleted file mode 100644
index baca86f5..00000000
--- a/vendor/Parsedown/LICENSE.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2013 Emanuil Rusev, erusev.com
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software is furnished to do so,
-subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/vendor/Parsedown/Parsedown.php b/vendor/Parsedown/Parsedown.php
deleted file mode 100644
index 5d6f0f76..00000000
--- a/vendor/Parsedown/Parsedown.php
+++ /dev/null
@@ -1,1423 +0,0 @@
-<?php
-
-namespace Parsedown;
-
-#
-#
-# Parsedown
-# http://parsedown.org
-#
-# (c) Emanuil Rusev
-# http://erusev.com
-#
-# For the full license information, view the LICENSE file that was distributed
-# with this source code.
-#
-#
-
-class Parsedown
-{
-    #
-    # Philosophy
-
-    # Parsedown recognises that the Markdown syntax is optimised for humans so
-    # it tries to read like one. It goes through text line by line. It looks at
-    # how lines start to identify blocks. It looks for special characters to
-    # identify inline elements.
-
-    #
-    # ~
-
-    function text($text)
-    {
-        # make sure no definitions are set
-        $this->Definitions = array();
-
-        # standardize line breaks
-        $text = str_replace("\r\n", "\n", $text);
-        $text = str_replace("\r", "\n", $text);
-
-        # replace tabs with spaces
-        $text = str_replace("\t", '    ', $text);
-
-        # remove surrounding line breaks
-        $text = trim($text, "\n");
-
-        # split text into lines
-        $lines = explode("\n", $text);
-
-        # iterate through lines to identify blocks
-        $markup = $this->lines($lines);
-
-        # trim line breaks
-        $markup = trim($markup, "\n");
-
-        return $markup;
-    }
-
-    #
-    # Setters
-    #
-
-    private $breaksEnabled;
-
-    function setBreaksEnabled($breaksEnabled)
-    {
-        $this->breaksEnabled = $breaksEnabled;
-
-        return $this;
-    }
-
-    private $markupEscaped;
-
-    function setMarkupEscaped($markupEscaped)
-    {
-        $this->markupEscaped = $markupEscaped;
-
-        return $this;
-    }
-
-    #
-    # Lines
-    #
-
-    protected $BlockTypes = array(
-        '#' => array('Atx'),
-        '*' => array('Rule', 'List'),
-        '+' => array('List'),
-        '-' => array('Setext', 'Table', 'Rule', 'List'),
-        '0' => array('List'),
-        '1' => array('List'),
-        '2' => array('List'),
-        '3' => array('List'),
-        '4' => array('List'),
-        '5' => array('List'),
-        '6' => array('List'),
-        '7' => array('List'),
-        '8' => array('List'),
-        '9' => array('List'),
-        ':' => array('Table'),
-        '<' => array('Comment', 'Markup'),
-        '=' => array('Setext'),
-        '>' => array('Quote'),
-        '_' => array('Rule'),
-        '`' => array('FencedCode'),
-        '|' => array('Table'),
-        '~' => array('FencedCode'),
-    );
-
-    # ~
-
-    protected $DefinitionTypes = array(
-        '[' => array('Reference'),
-    );
-
-    # ~
-
-    protected $unmarkedBlockTypes = array(
-        'CodeBlock',
-    );
-
-    #
-    # Blocks
-    #
-
-    private function lines(array $lines)
-    {
-        $CurrentBlock = null;
-
-        foreach ($lines as $line)
-        {
-            if (chop($line) === '')
-            {
-                if (isset($CurrentBlock))
-                {
-                    $CurrentBlock['interrupted'] = true;
-                }
-
-                continue;
-            }
-
-            $indent = 0;
-
-            while (isset($line[$indent]) and $line[$indent] === ' ')
-            {
-                $indent ++;
-            }
-
-            $text = $indent > 0 ? substr($line, $indent) : $line;
-
-            # ~
-
-            $Line = array('body' => $line, 'indent' => $indent, 'text' => $text);
-
-            # ~
-
-            if (isset($CurrentBlock['incomplete']))
-            {
-                $Block = $this->{'addTo'.$CurrentBlock['type']}($Line, $CurrentBlock);
-
-                if (isset($Block))
-                {
-                    $CurrentBlock = $Block;
-
-                    continue;
-                }
-                else
-                {
-                    if (method_exists($this, 'complete'.$CurrentBlock['type']))
-                    {
-                        $CurrentBlock = $this->{'complete'.$CurrentBlock['type']}($CurrentBlock);
-                    }
-
-                    unset($CurrentBlock['incomplete']);
-                }
-            }
-
-            # ~
-
-            $marker = $text[0];
-
-            if (isset($this->DefinitionTypes[$marker]))
-            {
-                foreach ($this->DefinitionTypes[$marker] as $definitionType)
-                {
-                    $Definition = $this->{'identify'.$definitionType}($Line, $CurrentBlock);
-
-                    if (isset($Definition))
-                    {
-                        $this->Definitions[$definitionType][$Definition['id']] = $Definition['data'];
-
-                        continue 2;
-                    }
-                }
-            }
-
-            # ~
-
-            $blockTypes = $this->unmarkedBlockTypes;
-
-            if (isset($this->BlockTypes[$marker]))
-            {
-                foreach ($this->BlockTypes[$marker] as $blockType)
-                {
-                    $blockTypes []= $blockType;
-                }
-            }
-
-            #
-            # ~
-
-            foreach ($blockTypes as $blockType)
-            {
-                $Block = $this->{'identify'.$blockType}($Line, $CurrentBlock);
-
-                if (isset($Block))
-                {
-                    $Block['type'] = $blockType;
-
-                    if ( ! isset($Block['identified']))
-                    {
-                        $Elements []= $CurrentBlock['element'];
-
-                        $Block['identified'] = true;
-                    }
-
-                    if (method_exists($this, 'addTo'.$blockType))
-                    {
-                        $Block['incomplete'] = true;
-                    }
-
-                    $CurrentBlock = $Block;
-
-                    continue 2;
-                }
-            }
-
-            # ~
-
-            if (isset($CurrentBlock) and ! isset($CurrentBlock['type']) and ! isset($CurrentBlock['interrupted']))
-            {
-                $CurrentBlock['element']['text'] .= "\n".$text;
-            }
-            else
-            {
-                $Elements []= $CurrentBlock['element'];
-
-                $CurrentBlock = $this->buildParagraph($Line);
-
-                $CurrentBlock['identified'] = true;
-            }
-        }
-
-        # ~
-
-        if (isset($CurrentBlock['incomplete']) and method_exists($this, 'complete'.$CurrentBlock['type']))
-        {
-            $CurrentBlock = $this->{'complete'.$CurrentBlock['type']}($CurrentBlock);
-        }
-
-        # ~
-
-        $Elements []= $CurrentBlock['element'];
-
-        unset($Elements[0]);
-
-        # ~
-
-        $markup = $this->elements($Elements);
-
-        # ~
-
-        return $markup;
-    }
-
-    #
-    # Atx
-
-    protected function identifyAtx($Line)
-    {
-        if (isset($Line['text'][1]))
-        {
-            $level = 1;
-
-            while (isset($Line['text'][$level]) and $Line['text'][$level] === '#')
-            {
-                $level ++;
-            }
-
-            $text = trim($Line['text'], '# ');
-
-            $Block = array(
-                'element' => array(
-                    'name' => 'h' . min(6, $level),
-                    'text' => $text,
-                    'handler' => 'line',
-                ),
-            );
-
-            return $Block;
-        }
-    }
-
-    #
-    # Code
-
-    protected function identifyCodeBlock($Line)
-    {
-        if ($Line['indent'] >= 4)
-        {
-            $text = substr($Line['body'], 4);
-
-            $Block = array(
-                'element' => array(
-                    'name' => 'pre',
-                    'handler' => 'element',
-                    'text' => array(
-                        'name' => 'code',
-                        'text' => $text,
-                    ),
-                ),
-            );
-
-            return $Block;
-        }
-    }
-
-    protected function addToCodeBlock($Line, $Block)
-    {
-        if ($Line['indent'] >= 4)
-        {
-            if (isset($Block['interrupted']))
-            {
-                $Block['element']['text']['text'] .= "\n";
-
-                unset($Block['interrupted']);
-            }
-
-            $Block['element']['text']['text'] .= "\n";
-
-            $text = substr($Line['body'], 4);
-
-            $Block['element']['text']['text'] .= $text;
-
-            return $Block;
-        }
-    }
-
-    protected function completeCodeBlock($Block)
-    {
-        $text = $Block['element']['text']['text'];
-
-        $text = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8');
-
-        $Block['element']['text']['text'] = $text;
-
-        return $Block;
-    }
-
-    #
-    # Comment
-
-    protected function identifyComment($Line)
-    {
-        if (isset($Line['text'][3]) and $Line['text'][3] === '-' and $Line['text'][2] === '-' and $Line['text'][1] === '!')
-        {
-            $Block = array(
-                'element' => $Line['body'],
-            );
-
-            if (preg_match('/-->$/', $Line['text']))
-            {
-                $Block['closed'] = true;
-            }
-
-            return $Block;
-        }
-    }
-
-    protected function addToComment($Line, array $Block)
-    {
-        if (isset($Block['closed']))
-        {
-            return;
-        }
-
-        $Block['element'] .= "\n" . $Line['body'];
-
-        if (preg_match('/-->$/', $Line['text']))
-        {
-            $Block['closed'] = true;
-        }
-
-        return $Block;
-    }
-
-    #
-    # Fenced Code
-
-    protected function identifyFencedCode($Line)
-    {
-        if (preg_match('/^(['.$Line['text'][0].']{3,})[ ]*([\w-]+)?[ ]*$/', $Line['text'], $matches))
-        {
-            $Element = array(
-                'name' => 'code',
-                'text' => '',
-            );
-
-            if (isset($matches[2]))
-            {
-                $class = 'language-'.$matches[2];
-
-                $Element['attributes'] = array(
-                    'class' => $class,
-                );
-            }
-
-            $Block = array(
-                'char' => $Line['text'][0],
-                'element' => array(
-                    'name' => 'pre',
-                    'handler' => 'element',
-                    'text' => $Element,
-                ),
-            );
-
-            return $Block;
-        }
-    }
-
-    protected function addToFencedCode($Line, $Block)
-    {
-        if (isset($Block['complete']))
-        {
-            return;
-        }
-
-        if (isset($Block['interrupted']))
-        {
-            $Block['element']['text']['text'] .= "\n";
-
-            unset($Block['interrupted']);
-        }
-
-        if (preg_match('/^'.$Block['char'].'{3,}[ ]*$/', $Line['text']))
-        {
-            $Block['element']['text']['text'] = substr($Block['element']['text']['text'], 1);
-
-            $Block['complete'] = true;
-
-            return $Block;
-        }
-
-        $Block['element']['text']['text'] .= "\n".$Line['body'];;
-
-        return $Block;
-    }
-
-    protected function completeFencedCode($Block)
-    {
-        $text = $Block['element']['text']['text'];
-
-        $text = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8');
-
-        $Block['element']['text']['text'] = $text;
-
-        return $Block;
-    }
-
-    #
-    # List
-
-    protected function identifyList($Line)
-    {
-        list($name, $pattern) = $Line['text'][0] <= '-' ? array('ul', '[*+-]') : array('ol', '[0-9]+[.]');
-
-        if (preg_match('/^('.$pattern.'[ ]+)(.*)/', $Line['text'], $matches))
-        {
-            $Block = array(
-                'indent' => $Line['indent'],
-                'pattern' => $pattern,
-                'element' => array(
-                    'name' => $name,
-                    'handler' => 'elements',
-                ),
-            );
-
-            $Block['li'] = array(
-                'name' => 'li',
-                'handler' => 'li',
-                'text' => array(
-                    $matches[2],
-                ),
-            );
-
-            $Block['element']['text'] []= & $Block['li'];
-
-            return $Block;
-        }
-    }
-
-    protected function addToList($Line, array $Block)
-    {
-        if ($Block['indent'] === $Line['indent'] and preg_match('/^'.$Block['pattern'].'[ ]+(.*)/', $Line['text'], $matches))
-        {
-            if (isset($Block['interrupted']))
-            {
-                $Block['li']['text'] []= '';
-
-                unset($Block['interrupted']);
-            }
-
-            unset($Block['li']);
-
-            $Block['li'] = array(
-                'name' => 'li',
-                'handler' => 'li',
-                'text' => array(
-                    $matches[1],
-                ),
-            );
-
-            $Block['element']['text'] []= & $Block['li'];
-
-            return $Block;
-        }
-
-        if ( ! isset($Block['interrupted']))
-        {
-            $text = preg_replace('/^[ ]{0,4}/', '', $Line['body']);
-
-            $Block['li']['text'] []= $text;
-
-            return $Block;
-        }
-
-        if ($Line['indent'] > 0)
-        {
-            $Block['li']['text'] []= '';
-
-            $text = preg_replace('/^[ ]{0,4}/', '', $Line['body']);
-
-            $Block['li']['text'] []= $text;
-
-            unset($Block['interrupted']);
-
-            return $Block;
-        }
-    }
-
-    #
-    # Quote
-
-    protected function identifyQuote($Line)
-    {
-        if (preg_match('/^>[ ]?(.*)/', $Line['text'], $matches))
-        {
-            $Block = array(
-                'element' => array(
-                    'name' => 'blockquote',
-                    'handler' => 'lines',
-                    'text' => (array) $matches[1],
-                ),
-            );
-
-            return $Block;
-        }
-    }
-
-    protected function addToQuote($Line, array $Block)
-    {
-        if ($Line['text'][0] === '>' and preg_match('/^>[ ]?(.*)/', $Line['text'], $matches))
-        {
-            if (isset($Block['interrupted']))
-            {
-                $Block['element']['text'] []= '';
-
-                unset($Block['interrupted']);
-            }
-
-            $Block['element']['text'] []= $matches[1];
-
-            return $Block;
-        }
-
-        if ( ! isset($Block['interrupted']))
-        {
-            $Block['element']['text'] []= $Line['text'];
-
-            return $Block;
-        }
-    }
-
-    #
-    # Rule
-
-    protected function identifyRule($Line)
-    {
-        if (preg_match('/^(['.$Line['text'][0].'])([ ]{0,2}\1){2,}[ ]*$/', $Line['text']))
-        {
-            $Block = array(
-                'element' => array(
-                    'name' => 'hr'
-                ),
-            );
-
-            return $Block;
-        }
-    }
-
-    #
-    # Setext
-
-    protected function identifySetext($Line, array $Block = null)
-    {
-        if ( ! isset($Block) or isset($Block['type']) or isset($Block['interrupted']))
-        {
-            return;
-        }
-
-        if (chop($Line['text'], $Line['text'][0]) === '')
-        {
-            $Block['element']['name'] = $Line['text'][0] === '=' ? 'h1' : 'h2';
-
-            return $Block;
-        }
-    }
-
-    #
-    # Markup
-
-    protected function identifyMarkup($Line)
-    {
-        if ($this->markupEscaped)
-        {
-            return;
-        }
-
-        if (preg_match('/^<(\w[\w\d]*)(?:[ ][^>]*)?(\/?)[ ]*>/', $Line['text'], $matches))
-        {
-            if (in_array($matches[1], $this->textLevelElements))
-            {
-                return;
-            }
-
-            $Block = array(
-                'element' => $Line['body'],
-            );
-
-            if ($matches[2] or $matches[1] === 'hr' or preg_match('/<\/'.$matches[1].'>[ ]*$/', $Line['text']))
-            {
-                $Block['closed'] = true;
-            }
-            else
-            {
-                $Block['depth'] = 0;
-                $Block['name'] = $matches[1];
-            }
-
-            return $Block;
-        }
-    }
-
-    protected function addToMarkup($Line, array $Block)
-    {
-        if (isset($Block['closed']))
-        {
-            return;
-        }
-
-        if (preg_match('/<'.$Block['name'].'([ ][^\/]+)?>/', $Line['text'])) # opening tag
-        {
-            $Block['depth'] ++;
-        }
-
-        if (stripos($Line['text'], '</'.$Block['name'].'>') !== false) # closing tag
-        {
-            if ($Block['depth'] > 0)
-            {
-                $Block['depth'] --;
-            }
-            else
-            {
-                $Block['closed'] = true;
-            }
-        }
-
-        $Block['element'] .= "\n".$Line['body'];
-
-        return $Block;
-    }
-
-    #
-    # Table
-
-    protected function identifyTable($Line, array $Block = null)
-    {
-        if ( ! isset($Block) or isset($Block['type']) or isset($Block['interrupted']))
-        {
-            return;
-        }
-
-        if (strpos($Block['element']['text'], '|') !== false and chop($Line['text'], ' -:|') === '')
-        {
-            $alignments = array();
-
-            $divider = $Line['text'];
-
-            $divider = trim($divider);
-            $divider = trim($divider, '|');
-
-            $dividerCells = explode('|', $divider);
-
-            foreach ($dividerCells as $dividerCell)
-            {
-                $dividerCell = trim($dividerCell);
-
-                if ($dividerCell === '')
-                {
-                    continue;
-                }
-
-                $alignment = null;
-
-                if ($dividerCell[0] === ':')
-                {
-                    $alignment = 'left';
-                }
-
-                if (substr($dividerCell, -1) === ':')
-                {
-                    $alignment = $alignment === 'left' ? 'center' : 'right';
-                }
-
-                $alignments []= $alignment;
-            }
-
-            # ~
-
-            $HeaderElements = array();
-
-            $header = $Block['element']['text'];
-
-            $header = trim($header);
-            $header = trim($header, '|');
-
-            $headerCells = explode('|', $header);
-
-            foreach ($headerCells as $index => $headerCell)
-            {
-                $headerCell = trim($headerCell);
-
-                $HeaderElement = array(
-                    'name' => 'th',
-                    'text' => $headerCell,
-                    'handler' => 'line',
-                );
-
-                if (isset($alignments[$index]))
-                {
-                    $alignment = $alignments[$index];
-
-                    $HeaderElement['attributes'] = array(
-                        'align' => $alignment,
-                    );
-                }
-
-                $HeaderElements []= $HeaderElement;
-            }
-
-            # ~
-
-            $Block = array(
-                'alignments' => $alignments,
-                'identified' => true,
-                'element' => array(
-                    'name' => 'table',
-                    'handler' => 'elements',
-                ),
-            );
-
-            $Block['element']['text'] []= array(
-                'name' => 'thead',
-                'handler' => 'elements',
-            );
-
-            $Block['element']['text'] []= array(
-                'name' => 'tbody',
-                'handler' => 'elements',
-                'text' => array(),
-            );
-
-            $Block['element']['text'][0]['text'] []= array(
-                'name' => 'tr',
-                'handler' => 'elements',
-                'text' => $HeaderElements,
-            );
-
-            return $Block;
-        }
-    }
-
-    protected function addToTable($Line, array $Block)
-    {
-        if ($Line['text'][0] === '|' or strpos($Line['text'], '|'))
-        {
-            $Elements = array();
-
-            $row = $Line['text'];
-
-            $row = trim($row);
-            $row = trim($row, '|');
-
-            $cells = explode('|', $row);
-
-            foreach ($cells as $index => $cell)
-            {
-                $cell = trim($cell);
-
-                $Element = array(
-                    'name' => 'td',
-                    'handler' => 'line',
-                    'text' => $cell,
-                );
-
-                if (isset($Block['alignments'][$index]))
-                {
-                    $Element['attributes'] = array(
-                        'align' => $Block['alignments'][$index],
-                    );
-                }
-
-                $Elements []= $Element;
-            }
-
-            $Element = array(
-                'name' => 'tr',
-                'handler' => 'elements',
-                'text' => $Elements,
-            );
-
-            $Block['element']['text'][1]['text'] []= $Element;
-
-            return $Block;
-        }
-    }
-
-    #
-    # Definitions
-    #
-
-    protected function identifyReference($Line)
-    {
-        if (preg_match('/^\[(.+?)\]:[ ]*<?(\S+?)>?(?:[ ]+["\'(](.+)["\')])?[ ]*$/', $Line['text'], $matches))
-        {
-            $Definition = array(
-                'id' => strtolower($matches[1]),
-                'data' => array(
-                    'url' => $matches[2],
-                ),
-            );
-
-            if (isset($matches[3]))
-            {
-                $Definition['data']['title'] = $matches[3];
-            }
-
-            return $Definition;
-        }
-    }
-
-    #
-    # ~
-    #
-
-    protected function buildParagraph($Line)
-    {
-        $Block = array(
-            'element' => array(
-                'name' => 'p',
-                'text' => $Line['text'],
-                'handler' => 'line',
-            ),
-        );
-
-        return $Block;
-    }
-
-    #
-    # ~
-    #
-
-    protected function element(array $Element)
-    {
-        $markup = '<'.$Element['name'];
-
-        if (isset($Element['attributes']))
-        {
-            foreach ($Element['attributes'] as $name => $value)
-            {
-                $markup .= ' '.$name.'="'.$value.'"';
-            }
-        }
-
-        if (isset($Element['text']))
-        {
-            $markup .= '>';
-
-            if (isset($Element['handler']))
-            {
-                $markup .= $this->$Element['handler']($Element['text']);
-            }
-            else
-            {
-                $markup .= $Element['text'];
-            }
-
-            $markup .= '</'.$Element['name'].'>';
-        }
-        else
-        {
-            $markup .= ' />';
-        }
-
-        return $markup;
-    }
-
-    protected function elements(array $Elements)
-    {
-        $markup = '';
-
-        foreach ($Elements as $Element)
-        {
-            if ($Element === null)
-            {
-                continue;
-            }
-
-            $markup .= "\n";
-
-            if (is_string($Element)) # because of Markup
-            {
-                $markup .= $Element;
-
-                continue;
-            }
-
-            $markup .= $this->element($Element);
-        }
-
-        $markup .= "\n";
-
-        return $markup;
-    }
-
-    #
-    # Spans
-    #
-
-    protected $SpanTypes = array(
-        '!' => array('Link'), # ?
-        '&' => array('Ampersand'),
-        '*' => array('Emphasis'),
-        '/' => array('Url'),
-        '<' => array('UrlTag', 'EmailTag', 'Tag', 'LessThan'),
-        '[' => array('Link'),
-        '_' => array('Emphasis'),
-        '`' => array('InlineCode'),
-        '~' => array('Strikethrough'),
-        '\\' => array('EscapeSequence'),
-    );
-
-    # ~
-
-    protected $spanMarkerList = '*_!&[</`~\\';
-
-    #
-    # ~
-    #
-
-    public function line($text)
-    {
-        $markup = '';
-
-        $remainder = $text;
-
-        $markerPosition = 0;
-
-        while ($excerpt = strpbrk($remainder, $this->spanMarkerList))
-        {
-            $marker = $excerpt[0];
-
-            $markerPosition += strpos($remainder, $marker);
-
-            $Excerpt = array('text' => $excerpt, 'context' => $text);
-
-            foreach ($this->SpanTypes[$marker] as $spanType)
-            {
-                $handler = 'identify'.$spanType;
-
-                $Span = $this->$handler($Excerpt);
-
-                if ( ! isset($Span))
-                {
-                    continue;
-                }
-
-                # The identified span can be ahead of the marker.
-
-                if (isset($Span['position']) and $Span['position'] > $markerPosition)
-                {
-                    continue;
-                }
-
-                # Spans that start at the position of their marker don't have to set a position.
-
-                if ( ! isset($Span['position']))
-                {
-                    $Span['position'] = $markerPosition;
-                }
-
-                $plainText = substr($text, 0, $Span['position']);
-
-                $markup .= $this->readPlainText($plainText);
-
-                $markup .= isset($Span['markup']) ? $Span['markup'] : $this->element($Span['element']);
-
-                $text = substr($text, $Span['position'] + $Span['extent']);
-
-                $remainder = $text;
-
-                $markerPosition = 0;
-
-                continue 2;
-            }
-
-            $remainder = substr($excerpt, 1);
-
-            $markerPosition ++;
-        }
-
-        $markup .= $this->readPlainText($text);
-
-        return $markup;
-    }
-
-    #
-    # ~
-    #
-
-    protected function identifyUrl($Excerpt)
-    {
-        if ( ! isset($Excerpt['text'][1]) or $Excerpt['text'][1] !== '/')
-        {
-            return;
-        }
-
-        if (preg_match('/\bhttps?:[\/]{2}[^\s<]+\b\/*/ui', $Excerpt['context'], $matches, PREG_OFFSET_CAPTURE))
-        {
-            $url = str_replace(array('&', '<'), array('&amp;', '&lt;'), $matches[0][0]);
-
-            return array(
-                'extent' => strlen($matches[0][0]),
-                'position' => $matches[0][1],
-                'element' => array(
-                    'name' => 'a',
-                    'text' => $url,
-                    'attributes' => array(
-                        'href' => $url,
-                    ),
-                ),
-            );
-        }
-    }
-
-    protected function identifyAmpersand($Excerpt)
-    {
-        if ( ! preg_match('/^&#?\w+;/', $Excerpt['text']))
-        {
-            return array(
-                'markup' => '&amp;',
-                'extent' => 1,
-            );
-        }
-    }
-
-    protected function identifyStrikethrough($Excerpt)
-    {
-        if ( ! isset($Excerpt['text'][1]))
-        {
-            return;
-        }
-
-        if ($Excerpt['text'][1] === '~' and preg_match('/^~~(?=\S)(.+?)(?<=\S)~~/', $Excerpt['text'], $matches))
-        {
-            return array(
-                'extent' => strlen($matches[0]),
-                'element' => array(
-                    'name' => 'del',
-                    'text' => $matches[1],
-                    'handler' => 'line',
-                ),
-            );
-        }
-    }
-
-    protected function identifyEscapeSequence($Excerpt)
-    {
-        if (isset($Excerpt['text'][1]) and in_array($Excerpt['text'][1], $this->specialCharacters))
-        {
-            return array(
-                'markup' => $Excerpt['text'][1],
-                'extent' => 2,
-            );
-        }
-    }
-
-    protected function identifyLessThan()
-    {
-        return array(
-            'markup' => '&lt;',
-            'extent' => 1,
-        );
-    }
-
-    protected function identifyUrlTag($Excerpt)
-    {
-        if (strpos($Excerpt['text'], '>') !== false and preg_match('/^<(https?:[\/]{2}[^\s]+?)>/i', $Excerpt['text'], $matches))
-        {
-            $url = str_replace(array('&', '<'), array('&amp;', '&lt;'), $matches[1]);
-
-            return array(
-                'extent' => strlen($matches[0]),
-                'element' => array(
-                    'name' => 'a',
-                    'text' => $url,
-                    'attributes' => array(
-                        'href' => $url,
-                    ),
-                ),
-            );
-        }
-    }
-
-    protected function identifyEmailTag($Excerpt)
-    {
-        if (strpos($Excerpt['text'], '>') !== false and preg_match('/^<(\S+?@\S+?)>/', $Excerpt['text'], $matches))
-        {
-            return array(
-                'extent' => strlen($matches[0]),
-                'element' => array(
-                    'name' => 'a',
-                    'text' => $matches[1],
-                    'attributes' => array(
-                        'href' => 'mailto:'.$matches[1],
-                    ),
-                ),
-            );
-        }
-    }
-
-    protected function identifyTag($Excerpt)
-    {
-        if ($this->markupEscaped)
-        {
-            return;
-        }
-
-        if (strpos($Excerpt['text'], '>') !== false and preg_match('/^<\/?\w.*?>/', $Excerpt['text'], $matches))
-        {
-            return array(
-                'markup' => $matches[0],
-                'extent' => strlen($matches[0]),
-            );
-        }
-    }
-
-    protected function identifyInlineCode($Excerpt)
-    {
-        $marker = $Excerpt['text'][0];
-
-        if (preg_match('/^('.$marker.'+)[ ]*(.+?)[ ]*(?<!'.$marker.')\1(?!'.$marker.')/', $Excerpt['text'], $matches))
-        {
-            $text = $matches[2];
-            $text = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8');
-
-            return array(
-                'extent' => strlen($matches[0]),
-                'element' => array(
-                    'name' => 'code',
-                    'text' => $text,
-                ),
-            );
-        }
-    }
-
-    protected function identifyLink($Excerpt)
-    {
-        $extent = $Excerpt['text'][0] === '!' ? 1 : 0;
-
-        if (strpos($Excerpt['text'], ']') and preg_match('/\[((?:[^][]|(?R))*)\]/', $Excerpt['text'], $matches))
-        {
-            $Link = array('text' => $matches[1], 'label' => strtolower($matches[1]));
-
-            $extent += strlen($matches[0]);
-
-            $substring = substr($Excerpt['text'], $extent);
-
-            if (preg_match('/^\s*\[([^][]+)\]/', $substring, $matches))
-            {
-                $Link['label'] = strtolower($matches[1]);
-
-                if (isset($this->Definitions['Reference'][$Link['label']]))
-                {
-                    $Link += $this->Definitions['Reference'][$Link['label']];
-
-                    $extent += strlen($matches[0]);
-                }
-                else
-                {
-                    return;
-                }
-            }
-            elseif (isset($this->Definitions['Reference'][$Link['label']]))
-            {
-                $Link += $this->Definitions['Reference'][$Link['label']];
-
-                if (preg_match('/^[ ]*\[\]/', $substring, $matches))
-                {
-                    $extent += strlen($matches[0]);
-                }
-            }
-            elseif (preg_match('/^\([ ]*(.*?)(?:[ ]+[\'"](.+?)[\'"])?[ ]*\)/', $substring, $matches))
-            {
-                $Link['url'] = $matches[1];
-
-                if (isset($matches[2]))
-                {
-                    $Link['title'] = $matches[2];
-                }
-
-                $extent += strlen($matches[0]);
-            }
-            else
-            {
-                return;
-            }
-        }
-        else
-        {
-            return;
-        }
-
-        $url = str_replace(array('&', '<'), array('&amp;', '&lt;'), $Link['url']);
-
-        if ($Excerpt['text'][0] === '!')
-        {
-            $Element = array(
-                'name' => 'img',
-                'attributes' => array(
-                    'alt' => $Link['text'],
-                    'src' => $url,
-                ),
-            );
-        }
-        else
-        {
-            $Element = array(
-                'name' => 'a',
-                'handler' => 'line',
-                'text' => $Link['text'],
-                'attributes' => array(
-                    'href' => $url,
-                ),
-            );
-        }
-
-        if (isset($Link['title']))
-        {
-            $Element['attributes']['title'] = $Link['title'];
-        }
-
-        return array(
-            'extent' => $extent,
-            'element' => $Element,
-        );
-    }
-
-    protected function identifyEmphasis($Excerpt)
-    {
-        if ( ! isset($Excerpt['text'][1]))
-        {
-            return;
-        }
-
-        $marker = $Excerpt['text'][0];
-
-        if ($Excerpt['text'][1] === $marker and preg_match($this->StrongRegex[$marker], $Excerpt['text'], $matches))
-        {
-            $emphasis = 'strong';
-        }
-        elseif (preg_match($this->EmRegex[$marker], $Excerpt['text'], $matches))
-        {
-            $emphasis = 'em';
-        }
-        else
-        {
-            return;
-        }
-
-        return array(
-            'extent' => strlen($matches[0]),
-            'element' => array(
-                'name' => $emphasis,
-                'handler' => 'line',
-                'text' => $matches[1],
-            ),
-        );
-    }
-
-    #
-    # ~
-
-    protected function readPlainText($text)
-    {
-        $breakMarker = $this->breaksEnabled ? "\n" : "  \n";
-
-        $text = str_replace($breakMarker, "<br />\n", $text);
-
-        return $text;
-    }
-
-    #
-    # ~
-    #
-
-    protected function li($lines)
-    {
-        $markup = $this->lines($lines);
-
-        $trimmedMarkup = trim($markup);
-
-        if ( ! in_array('', $lines) and substr($trimmedMarkup, 0, 3) === '<p>')
-        {
-            $markup = $trimmedMarkup;
-            $markup = substr($markup, 3);
-
-            $position = strpos($markup, "</p>");
-
-            $markup = substr_replace($markup, '', $position, 4);
-        }
-
-        return $markup;
-    }
-
-    #
-    # Multiton
-    #
-
-    static function instance($name = 'default')
-    {
-        if (isset(self::$instances[$name]))
-        {
-            return self::$instances[$name];
-        }
-
-        $instance = new self();
-
-        self::$instances[$name] = $instance;
-
-        return $instance;
-    }
-
-    private static $instances = array();
-
-    #
-    # Deprecated Methods
-    #
-
-    /**
-     * @deprecated in favor of "text"
-     */
-    function parse($text)
-    {
-        $markup = $this->text($text);
-
-        return $markup;
-    }
-
-    #
-    # Fields
-    #
-
-    protected $Definitions;
-
-    #
-    # Read-only
-
-    protected $specialCharacters = array(
-        '\\', '`', '*', '_', '{', '}', '[', ']', '(', ')', '>', '#', '+', '-', '.', '!',
-    );
-
-    protected $StrongRegex = array(
-        '*' => '/^[*]{2}((?:[^*]|[*][^*]*[*])+?)[*]{2}(?![*])/s',
-        '_' => '/^__((?:[^_]|_[^_]*_)+?)__(?!_)/us',
-    );
-
-    protected $EmRegex = array(
-        '*' => '/^[*]((?:[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s',
-        '_' => '/^_((?:[^_]|__[^_]*__)+?)_(?!_)\b/us',
-    );
-
-    protected $textLevelElements = array(
-        'a', 'br', 'bdo', 'abbr', 'blink', 'nextid', 'acronym', 'basefont',
-        'b', 'em', 'big', 'cite', 'small', 'spacer', 'listing',
-        'i', 'rp', 'del', 'code',          'strike', 'marquee',
-        'q', 'rt', 'ins', 'font',          'strong',
-        's', 'tt', 'sub', 'mark',
-        'u', 'xm', 'sup', 'nobr',
-                   'var', 'ruby',
-                   'wbr', 'span',
-                          'time',
-    );
-}