Add a very simple test suite

@latentflip you can also set up travis to run your tests, I've added a build status image for this.

I'm hoping to update the functionality to allow me to set the 'debug' key, as I'm using @3rd-Eden's `primus` and there's clashes with the `debug` module.
Did you mean to leave this in the commit? It seems like maybe you were doing that for local testing and forgot to uncomment it out?