Skip Bugzilla's process_bug.cgi

When you update anything on Bugzilla, you're left on process_bug.cgi, a POSTed page. This sucks. POST is for data, GET is for web pages.

When process_bug.cgi is detected, document.location is changed to the bug's real location and any email notifications are shown with jetpack.notifications.

This jetpack uses some terrible screen scraping that's likely to break, but I'll probably fix it quickly since I'm on bugzilla every day.