Maven-ized version of the addon

This request is in regard to issue #4 (Build)

I wanted to extend this great add-on, but would also like to include it in my normal build chain. Since it appears you want to switch to Maven anyway, here's the converted project.

I've followed the Maven archetype for add-ons, but with a few tweaks. I did remove the license section, since I'm not sure what license you are releasing this add-on under. You can add it back in if you like.