We had a bunch of useful and complex code in Review Board to

render/style Markdown files in a more WYSIWYG-ish format (matching the

output styles/spacing to the input), generate e-mails with Markdown

styles inlined, escape/unescape content for Markdown rendering, and

perform other types of processing.
This isn't specific to Review Board, and would be very nice to reuse, so

it's now in Djblets. The utility functions live in the new

djblets.markdown module, with extensions living in

djblets.markdown.extensions.wysiwyg and

djblets.markdown.extensions.wysiwyg_email.
The styles for rendering the Markdown content lives in a new mixin,

which can be injected into any CSS rule the consuming project chooses.

Unit tests pass.
Tested that all the new stuff works with Review Board still (after moving over to this).