Add a create-post command.
Add .mmd extension to the text extensions.
Add snippet to laod highlight.js.

See http://highlightjs.org.
Remove 'cp' alias from create-post command.
Use Nanoc's attribute_to_time() to parse dates/times.
Add a MultiMarkdown filter.

See also: http://fletcherpenney.net/multimarkdown/
Add rule to compile .mmd posts.
Add an example post written in MultiMarkdown.
Fix typo in MultiMarkdown sample post.
Accept CriticMarkup changes when using the MMD filter.
Move the MultiMarkdown filter to the correct folder.
Update README.