Added HTML e-mail support.
Review Request #971 — Created Aug. 17, 2009 and submitted
Added HTML e-mail support. This change introduces support for sending HTML versions of e-mails along with the text versions. If the user's e-mail client supports HTML e-mails, they will show up instead of the older text e-mails. These new e-mails provide a lot more useful information. The review request portions contain screenshot thumbnails, links to the diff viewer, and resemble the review request box on Review Board. The review e-mails contain the comment and screenshot fragments commented on, and links for adding comments, which redirect to the review request pages. The reply e-mails quote the review e-mails and look like standard e-mail quoting, but contain the thread of replies, just like the text versions of the e-mails. This also moves all the e-mail-related templates out of reviews and into notifications. This has been tested on GMail, Yahoo Mail, Thunderbird 2.0, and Outlook 2007.
Tested all HTML e-mail types GMail, Yahoo Mail, Thunderbird 2.0, and Outlook 2007. They look decent in each. Made sure that the text versions showed up when HTML e-mails were disabled in Thunderbird. Note that in the screenshots, the "On ..., foo wrote:" lines don't include a timestamp. This is not a bug. This is just a side-effect of my test setup. I never populated that field when sending out the e-mail here.
Made changes requested by David.