Only publish compiled javascript

* Adds a prepublish task that compiles the source coffeescript files into
javascript.
* Makes coffee-script a development dependency
* Cleans up .gitignore following the unfirepitification
* Adds a .npmignore so we don't publish anything we don't need.

Closes #7.
Bump to 0.0.3

Following dependency cleanup and changing what exactly we're publishing.