Merge pull request #317 from xoppa/new3dapi

New3dapi, various changes
Merge pull request #318 from xoppa/new3dapi

Redesign ModelBuilder
Merge pull request #321 from xoppa/new3dapi

Update getMaxTextureUnits, add sphere and cone, add BasicShapeTest
more animation stuff
Merge branch 'new3dapi' of https://github.com/libgdx/libgdx into new3dapi
i suck
Merge pull request #322 from xoppa/new3dapi

New3dapi: Add Model.ManagedInstance, implement Disposable for Model, ModelInstance...
fixed up Xoppa's PR as discussed on IRC
made attribte non-disposable again
introduced RenderableProvider, to generalize ModelBatch
- Move ObjLoader

- Make JsonModelLoader dont implement ModelLoader
- Rename NewMaterial to Material
- Add ModelInstance constructor by position
Add GLES10Shader
- Update the tests to use the new 3d api

- Disable ShadowMappingTest and SoftMeshTest for now
- Update gdxinvaders to use new 3d api (todo: explosions)
- Remove old g3d stuff