Various changes regarding lights/environment/defaultshaders
Merge branch 'master' of https://github.com/libgdx/libgdx into 3dapi
Update invaders
Update tests
Add Fog attribute
Update more tests
BaseShader combine material and environment
Move Environment and add CubemapAttribute
Update GWT
Fix gles10 blending
Merge pull request #775 from xoppa/3dapi

3dapi: remove Lights, add Environment and others