simplify coffee compilation

Hey! Over at Carrot Creative we're building a tool called [ship](https://github.com/carrot/ship) for deploying static sites (mostly). So I'm thinking about using nsync for a lot of the file moving & I'm willing to help to make it stable.

Anyway, this PR makes it a bit easier to build the coffeescript (and a couple other changes). Tell me what you think! :smile: