Got rid of that big ugly base64 blob which was only a temporary crutch anyway. Added a png file instead. Use File.read rather than File.open for a 66% reduction in verbosity.
Removed some cargo-cult HTML attributes and CSS. Styling HTML for email clients is trickier than for browsers, I'm trying to keep the code as succinct but also as compatible as possible.
Add support for commenting on changesets with RSS feeds and email
notification of comments to other commenters and people that have
chosen to subscribe to a changeset.