Use AMD-style modules

This is how I generally set up my projects (this is exactly how Gunoki is structured too). `es6-module-transpiler` is used to convert the nice `import xxx from 'yyy'` statements into the ugly AMD syntax via cogs. This also allows you to drop the global definitions as well as the `//= require ...` statements. Let me know if you have any questions!

EDIT: Also, I added a Makefile (of course) with `make` doing cogs in watch mode and `make compress` creating the compressed file.
I saw this in the Cogs readme. What does it mean?