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
Reorder b23 in CHANGES.md
Update version to b23.
Rename all instances of cesium.agi.com to cesiumjs.org.

Cherry-picked from @kring's d0e34a7a.
Tracking shouldn't be in master.

Also, found a straggler.
Update CHANGES.md
Update CHANGES.md again
Merge pull request #1320 from AnalyticalGraphicsInc/update-address

Update master's references to the website.
Drop MOZ_ WebGL extension prefixes to avoid warnings in Firefox
Changed extensions to use undefined when not available
Added failIfMajorPerformanceCaveat