Add tools lib

This is a library for miscellaneous tools that don't warrant their own
library.
Create file-store module

This module handles the very basic job of storing and deleting files. In
the future, it will be possible to have this store files in cloud
storage providers like Amazon, or just different places on the file
system.
Setup mocha test framework for app

I also upgraded CoffeeScript and went through some pain getting Mocha to
use its new version.