Panels3 - header and about 'page'

The header was changed and the need for #scroller was removed, so those were commented out. It should actually work...

Also, the about panel was added, with formatting, etc., and the panel transition works, though it's still got that buggy bit I can't work out. I also edited the text and the order of the text a bit, but the original is still in the file, just commented out.

The css is a bit messy. I wasn't sure exactly where to put it and I'm not up with sass, so I just put everything in _global.css, sorry guys.

You should probably check it over to see if everything's ok...