allow markdown in comments
Now that we can allow comments, I'd like to be able to edit them as nicely as I can edit questions and answers.
If you *do* add markdown, and if possible, I'd also like for the meta-characters not to be counted as part of the x characters allowed in a comment
URLs are auto-linked in comments; lack of formatting in comments is by design
In that case it'd be nice to have some text near the comment box pointing out that the comment field acts totally different from the question/answer fields.