polyfill.js
===========
To rebuild or update res/js/polyfill.js you will need to have
[node.js](http://nodejs.org/) installed. Once you have it installed run the
following:
cd polyfill
npm install
grunt
If you want to create a verion of the polyfill.js that hasn't been minified,
say for debugging purposes, then run:
cd polyfill
npm install
grunt notmin