Initial commit
Allow a space between [link text] and (url)
Match trailing space that signals a line break
Fix bold/italic/code spanning blockquote indicator
Don't highlight link footnote after tab
Add missing .mkd extension detection
Tighten automatic link highlighting

Automatic link highlighting was erroneously being triggered on
<code>HEAD@{1}</code> because of the at sign outside of the tag.
Remove unconventional ftdetect augroup
Don't override filetypes other than conf
Extract YAML front matter handling to vim-liquid
Override filetype of modula2
Make inline code transparent
Allow up to 3 spaces before a link declaration
Support bold italic nesting
Allow alternative highlighting of `...`
Add highlighting for GitHub style code blocks
Highlight word underscores as errors
Loosen GitHub code block pattern
Don't unset include guard

Closes #7
Fix performance issue with detecting setext-style headers