Rich text/markdown on committer election criteria

When we created the committer election module, we intentionally made it plaintext because we knew that it would be delivered to mailing lists and that a lot of our committers at the time were old school curmudgeons who didn't like that newfangled HTML in emails. In fairness, I may have been the old school curmudgeon poster child.

I believe that this time has passed and that we should consider rich text options.