added proper disposal of things, need to fix Model#dispose, attribuets may have disposable resources, may even share them with other materials :/
Merge pull request #313 from xoppa/new3dapi

Additional NewMaterial constructors, use Array instances in ModelData
fixed node transform calculations
renamed addXXX methods to render in ModelBatch
made ModelBatch#render(Renderable) public, if someone doesn't want to use Models
Use new model for bullet tests
Cant commit without this
Merge branch 'new3dapi' of https://github.com/libgdx/libgdx into new3dapi

Conflicts:
	gdx/src/com/badlogic/gdx/graphics/g3d/Model.java
	gdx/src/com/badlogic/gdx/graphics/g3d/ModelBatch.java
	tests/gdx-tests/src/com/badlogic/gdx/tests/g3d/BatchRenderTest.java