2012-04-17: Moved tabzilla into the masthead

@craigcook craigcook tagged this Apr 16, 2012 · 11025 commits to master since this tag

The tab now aligns with the right side of the content. It looked weird way off to the right in wide windows, and hiding it at < 1250px would hide it from too many people. Sorry I didn't see this sooner, I've been away from MDN too much :(