make headings equal weight
add d3 dependency; add rudimentary d3 implementation in dashboard; add some basic styling with corresponding markup changes
add directives directory; minor refactor of rudimentary d3 implementation
refactor dashboard view into directives including d3 bar graph
Merge branch 'walker-d3' into styling

Conflicts:
	Gruntfile.js
	app/css/global.css
	app/views/dashboard-view.html
	app/views/gateway-view.html
	build/css/global.css
	build/views/dashboard-view.html
	build/views/gateway-view.html
	models/visit-model.js
copy ALL the necessary assets
Add missing files