DO NOT MERGE YET: Demo site V2

Looking for team feedback (copy, angular.js optimization) for the V2 style guide demo site. (rackerlabs.github.io/encore-ui/)

Going to continue submitting commits, especially those marked FIXME.
I know this section is called "Helper Classes", but I think it will help to be consistent in how you refer to classes. So here I would put: 
`.clearfix` class - Provides clearfix functionality. See http://nicolasgallagher.com/micro-clearfix-hack/

^^ also that URL should be made into a clickable link.