adding tag cloud helper and displaying it in homepage
Adding stylesheet and fixing login page error on layout

Conflicts:
	app/assets/stylesheets/sufia.css.scss
	app/views/layouts/_homepage_sidebar2.html.erb
only render tag cloud section on homepage if a blacklight query has been run. (ie don't render on login page)
only render tag cloud section on homepage if a blacklight query has been run. (ie don't render on login page)
switched to ajax and jquery-based tag cloud
Merge pull request #364 from psu-stewardship/tagcloud

Added ajax & jQuery based tag cloud "Explore" section to homepage