Uglify first then bundle

High-level flow:

* Copy `css` and `template` folders from `public/assets` into `public/assets-ugly`
 * Need this so that r.js can resolve templates and css requires
* Uglify all js files from `public/assets/js` into `public/assets-ugly/js`
* r.js apps from `public/assets-ugly` into `public/assets-built`
* Swap

- [ ] requires bump of grunt-be-ugly after merge of https://github.com/behance/grunt-be-ugly/pull/2