Change PixelFormat to constants
Rename description to options
Change PrimitiveType to constants
Change IndexDatatype to constants
Change TextureWrap to constants
Change texture filters to constants
Add missing test file
Uniform type renames to match WebGL
Fix typos.
Merge pull request #1318 from AnalyticalGraphicsInc/renderertweaks

Renderer tweaks
Merge branch 'master' into preprocess

Conflicts:
	Source/Renderer/Context.js