Jam support

I've made these small changes in order to get it published to the Jam package repository: http://groundcomputing.co.uk/code/jam/packages/#/details/coffee-script

It would be great if this was added upstream so I don't have to maintain a fork for these trivial changes, but I understand if you don't want to add a browser-focused package manger to your package.json, and prefer to keep it focused on Node.js.

Let me know, either way.

Thanks