Creating a limited JS file, removing file upload

Hi, nice library! We needed to build a reduced version for mobile users and so wanted to remove the file upload form element option. Wish there was a more elegant way of doing this, but we wound up selectively eliminating some coffee scripts & views. Also, we needed to create a build which reused some of the more common JS libraries and so created a new `grunt` build flow to produce `vendor_limited.js` which is used by the matching `index_limited.html` file.

Cheers!