Added PostProcessTest for basic single pass, fullscreen, frame buffer effects.
Moved gameplay-tests .pngs to png folder.
Fixed a few compiler warnings.
Added missing source files in gameplay-tests to android build script.
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Merge pull request #664 from seanpaultaylor/next

Next
Added post process test on xCode
Merge pull request #665 from seanpaultaylor/next

Added post process test on xCode
Fixed SobelEdge shader for post process test.
Merge pull request #666 from seanpaultaylor/next

Fixed SobelEdge shader for post process test.
Fixes typo trailing 's' causing a compile error.
Merge pull request #668 from seanpaultaylor/next

Fixes typo trailing 's' causing a compile error.
Updated my previous change so it casts instead of uses floor
Merge branch 'next' of https://github.com/blackberry/GamePlay into next

Conflicts:
	gameplay-tests/src/TextureTest.cpp