Add Trac Support

Add support for Edgewall Trac. Tested in versions 0.12 - 1.1.2dev of
Trac. Custom styles added for Trac v0.x, Trac v1.x, and WordPress Trac.
For now, supported domains are trac.edgewall.org, trac-hacks.org,
trac.wordpress.org, and bugs.jquery.org. We may want to add to this list
in the future or allow users to add their own custom domains in
extension options.
Merge branch 'master' into trac
Fixed service name in post start popup
Updated jira service name position in manifest
Fixed post start popup styles