Added clause for 10-day limit for stale issues

As per our discussion in the e-mail, I added the 10 day stale clause since this is the duration we all agreed on.
Slight wording change for the issue section title
Added Javadoc to the class and removed an unused constructor argument
Merge branch 'master' of https://github.com/MasDennis/Rajawali.git
Added a check for MaskPass and ClearMaskPass in the render method.
Added PostProcessingCopyMaterial with simpler GLSL shader code than
SimpleMaterial.
Added a method named logSystemInformation(). This outputs hardware and OpenGL information to LogCat which should be helpful when people log issues.
It should be called in RajawaliRenderer.initScene().
Added EffectComposer to RajawaliRenderer
Merge branch 'master' of https://github.com/MasDennis/Rajawali.git
Added maximum texture image unit information to logSystemInformation()
Merge branch 'master' of https://github.com/MasDennis/Rajawali

Conflicts:
	src/rajawali/effects/EffectComposer.java