Changing order on the index page to reflect the nav bar order.
Updating groupgraphs with Parag's comments.

- Setting main (if it exists) and the default group.
- Adding explaination to no jobs dialog.
- Decreasing size of margins on the header.
Adding group to the url, allowing link sharing.
Adding functional back and forward when navigating the groups.
Merge branch 'twitter-groupgraph' of git://github.com/djw8605/glideinWMS into branch_v2plus_2981

Conflicts:
	creation/web_base/frontendGroupGraphStatusNow.html