add d3
get rid of boiler plate, make 4 measures
simple container for beat
beat model toggles fill
get directive and behavior
added font-awesome to deps
Merge branch 'directive-beat'

Conflicts (resolved):
	app/scripts/controllers/main.js
	app/scripts/models/beat.js
	app/styles/main.css
	app/views/main.html
	bower.json