Plane bug fix. When the plane's axis was Axis.Z it faced the wrong direction.
Removed an unused variable.
The ScreenQuad's texture coordinates were wrong. Up side down.
started working on post processing.
also added a side by side renderer for virtual reality glasses.
Merge branch 'master' of https://github.com/MasDennis/Rajawali
Intermediate commit for the new post processing framework. Not working yet.
Merge branch 'master' of https://github.com/MasDennis/Rajawali

Conflicts:
	res/.README.md
Basic post processing is working now. Had a massive fight with the depth textures though. To be continued.
Intermediate commit
Merge branch 'master' of https://github.com/MasDennis/Rajawali
Fixes issues #1042 and #1041. Material.setColorInfluence() must now be set to 0 manually after a texture has been added to a material.
I've also added a flag in Object3D that indicates whether the material's color should be overridden or not.