Add a command line CoffeeScript compiler

[jgibson]

It would be useful to have a command line replacement for the CoffeeScript compiler provided by Node.JS's coffee-script module (coffee --compile). I've written one, but I don't know how to integrate it into your pip package.

[doloopwhile]

We can add __main__.py to priovide command line interface.

After adding them, please create a pull-request.