Add ability to convert relative links to absolute
Add footnote prefix option. Needs testing
Use parameters object for extra options. Enhance footnote support.

Option to add return links.
Option to make footnote prefixes unique, for rendering multiple
documents per page.
Move footnote prefix to a better place
Add tests for new footnote functionality
Add tests for absolute prefix
Fix spelling error
Merge pull request #86 from dimfeld/master

Add absolute link transformation and footnote enhancements
Remove unnecessary HTML_ABSOLUTE_LINKS flag
Merge pull request #88 from dimfeld/master

Remove unnecessary HTML_ABSOLUTE_LINKS flag
Add a reference to github_flavored_markdown in README.
Merge pull request #93 from shurcooL/patch-1

Add a reference to github_flavored_markdown in README.
Whitelisted th and td to fix #79
Merge pull request #95 from anonx/master

Whitelisted th and td to fix #79
Add titleblock support
Merge pull request #98 from cpuguy83/master

Add titleblock support
Fix misleading wording in README

Fixes #103.
Improve parser to detect LineBreak independently of renderer.

When checking if it's a newline preceeded by two spaces, look at the input data rather than the output, since the output depends on the renderer implementation.
Merge pull request #107 from shurcooL/master

Improve parser to detect LineBreak independently of renderer.
Use HTML5 recommended style of language on code blocks

For code blocks that contain a certain language of code, the recommended
attribute structure is <pre><code class="language-foo">. This also
corresponds to the behavior expected by various JS syntax highlighters.

The GitHub code block implementation was obsolete, and identical to the
normal implementation except for its attribute structure, so it was
removed.

Closes #108.