Android License plugin

So I have hacked out a plugin which runs against Google's Android plugin instead of the Java plugin.  I'm having some issues with guava versions but otherwise it seems to work OK.  Wouldn't mind some feedback.

Example usage is here : https://github.com/secondsun/aerogear-android-oauth2-demo/tree/license

As you can see in the build.gradle file I've excluded guava from the plugin which makes everything work.