VitaliyRodnenko/geeknote — pull request #229 by elleryq (2014-10-07 01:33:40+00:00)
Title: Implement customizing markdown2 extra syntax.

I would like to add the feature to customize markdown and here is my code.

markdown2 don't handle the syntax ``` code ``` in default.
markdown2 actually can do this by add 'extras' parameter in creating markdown object.
So I add argument in settings() to make user can choose the extra syntax they want.