big bang gradle fix :collision:

A big bang fix to the many gradle problems I found.
Please note that the structure is not really corresponding an Android Studio project.
I am also not sure that it will still work in eclipse.

However, I was able to build and run it now.

Biggest changes:
 - split gradle build files as expected by Android Studio
 - removed unnecessary jars and dependencies that are fetched by gradle (appcompat/androidannotations 2.5/3.0, etc.etc.)
 - Updated to android annotation 3.0.1. The old code used ```com.googleannotations.androidannotations.*``` which was prior v3. We now use ```org.androidannotations.*```

If you have any questions, let me know.