Skybox Push

Im pushing a commit that allows the use of skybox. At the moment only single textures like http://opengameart.org/sites/default/files/styles/medium/public/Medborgarplatsen.jpg or 6 textures (one for each side) which I also provided in the assets folder (they are a bit large at the moment so we might need to lower the resolution). Im also started to work on a Terrain class which will support heightmaps and standard meshes but its not included in this push.

Im really new to git so I probably did something wrong (my fault sorry) but I fixed errors by removing the texture-packer reference (otherwise you are unable to import the project without an error message )

Gdx-Proto looks really promising and can't wait until we get it as a library!

Cheers!