Update to Ember 1.5.1 and Bootstrap 3.1.1

Hi @bwship
I spent some time upgrading to ember 1.5.1 as you recommended in #4 and felt compelled to make some other improvements along the way. Sorry this is so big, a lot of these changes were kind of tied together.

Changes:
* Remove `node_modules`. They can be installed with `npm install`. If releases are made, they can include the `node_modules` folder.
* Remove compiled `js` and `css`. Less and coffeescript files are watched and recompiled along with the server  process by `grunt`.
* Remove client-side javascript libs and manage with `bower` instead.
* Upgrade to ember 1.5
* Upgrade to bootstrap 3.1.1
* Add mobile hamburger