Swap charts from gRaphael to D3
Mostly, this has just been sitting in my sandbox for a long time. I may also touch some charting stuff with subprojects/milestones, but don't have particular plans to do that.
D3 seems a bit more flexible, and it's easier to push more of the style logic into CSS so you can fix my design atrocities. gRaphael also hasn't been updated in ~3+ years.
Reviewed By: chad
Subscribers: cburroughs, yelirekim
Differential Revision: https://secure.phabricator.com/D15155