Subtree Merge of submodules/hqstyle-src into corehq/apps/style

- also some minor directory restructuring

Part 2 of this will be utilizing django-compressor and getting rid of the compiled / minified files and incorporating less.js
Part 3 will include upgrading to Bootstrap 3.

This doesn't change any functionality, other than where the final static files are located. So if they styles load fine on preview, I'd say this is g2 push. I tested it pretty extensively locally.