Merge pull request #3 from bwinton/master

Add buttons that don’t do much, and make things look nicer.
Merge pull request #4 from bwinton/master

It's fancy!
Merge pull request #5 from bwinton/master

Add a numbers button.
Merge pull request #6 from bwinton/master

Get the arcs animating!  \o/
Merge branch 'master' of https://github.com/mhoye/mozgraphs