Skeleton animation bug fix. Shouldn't call super.setShaderParams() because it is a container only.
Skeletal Animation code clean up. Also merged GPUSkinningMaterial into DiffuseMaterial and PhongMaterial. Changed the default to a non-glossy material.
While doing this I've come to the conclusion that materials need a bit of an overhaul.
Merge branch 'master' of git://github.com/MasDennis/Rajawali
Merge remote-tracking branch 'origin/master' into improved_primitives