Package manager compliance

A tiny change to make the package compliant with [Melpa](http://melpa.milkbox.net/)/[Marmelade](http://marmalade-repo.org/). The requirements are [here](http://www.marmalade-repo.org/doc-files/package.5.html#SINGLE-FILE-PACKAGES), see the first paragraph.

It would be cool if you could add this to one of the package repositories to make it more convenient to install.