Remove sample coverage to keep in sync with glTF 0.8
Update model tests for glTF 0.8 update
Merge remote-tracking branch 'origin/master' into gltf-8-tweaks
Merge remote-tracking branch 'origin/master' into gltf-8-tweaks
Merge pull request #2239 from AnalyticalGraphicsInc/gltf-8-tweaks

Update render states to glTF 0.8