Now using JodaTime for CalendarDataStore month retrieval

Also removed the isLeapYear method, which is no longer referenced.
There is a copy of this method in PhotoStore, but after this method's
removal I believe that copy to be the only version of the method.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
restricted width of channel names in graphers so that their control buttons don't get hidden
Merge remote-tracking branch 'upstream/master'
Automatic grapher update from commit localdisplay:2d462e9+
added caching of images served through the RetinaController
updated grapher code to the version with gwt native canvas.
Merge remote-tracking branch 'origin/master'

Conflicts:
	fluxtream-web/src/main/webapp/static/grapher4/grapher2.nocache.js
Merge branch 'master' of github.com:fluxtream/fluxtream-app into idempotent_updates