Updated to Spiller v2.3

Updated Box2D extension
Updated the Box2D examples
Updated libgdx dependencies
Removed useless files in android projects
Renamed spiller-controller-extension to spiller-controller
Created a augmented reality extension
Created a In App Purchases extension
Added a dungeon generator
Added a maze generator
Added a dungeon generator example
Added a maze generator example
Added some shuffle methods to Spig and SpiU