Drop MOZ_ WebGL extension prefixes to avoid warnings in Firefox
Changed extensions to use undefined when not available
Added failIfMajorPerformanceCaveat
Workaround tests until failIfMajorPerformanceCaveat is returned by getContextAttributes
Undefined tweak
Added allowTextureFilterAnisotropic
Update CHANGES.md
Added maximumScreenSpaceError
Changes based on review
Merge pull request #1321 from AnalyticalGraphicsInc/christmas

Merry Christmas