#300 - Upgrade frontend dependancies

This pull request upgrades our 2 main front end dependancies: Bootstrap and Font Awesome. Ckan 2.0 now has crisper icons and clearer typography (as well as a few other tweaks).

It's deceptively big. 

Best way to review: boot up CKAN and click on every link ever.

Ignore: 9c83367, d5e054d and cab606b as they are upgrades to the libraries. Everything else is tweaks to the front end after upgrading both libraries.