Stopped reloading uninitialized PostProcessingRenderer

If the PostProcessingRenderer has not been initialized and mTextureSize
is still set to -1, attempting to reload it will raise a GL error.
Copy paste error
Support for localized pitch, yaw, and roll
Merge pull request #514 from AndrewJo/master

Pitch, yaw, and roll for Camera
Merge pull request #507 from Kazetsukai/master

Prevent reloading of uninitialized PostProcessingRenderer in RajawaliRenderer
Merge branch 'master' of https://github.com/MasDennis/Rajawali