Support Pandoc Extensions to Markdown

[GoogleCodeExporter]

I was wondering if I could get support for the Pandoc extensions to Markdwon, 
and in particular, the support for definition lists. It's a very nice extension 
that greatly improves the readability of documents including definition lists 
without requiring dt, dd, and dl tags everywhere, which are very ugly and 
verbose.

Original issue reported on code.google.com by arcf...@sacrideo.us on 20 Jun 2013 at 4:01