Build: Update grunt to ~1.0.4

Decreases build times due to an updated glob sub-dependency. Windows gets a drastic speed boost. Linux probably also benefits.

From a cold boot in Windows, grunt dist used to take ~19 minutes... now it only takes ~6.5 minutes (3x faster). The speed-up is mostly due to the cssmin tasks becoming much faster (14 minutes became 1 minute). Grunt dist is currently setup to automatically run at the end of npm install.

This PR's generated dist folder is virtually identical to before. Only difference is that /dist/wet-boew/payload.json's entries are now sorted alphabetically.

The newer version of CoffeeScript used in grunt 1.0.4 doesn't appear to introduce any breaking changes to Gruntfile.coffee.