Merge master to ddr
Updates from review.
Fix debug bounding spheres.
Remove unused line of code.
Updates from review.
Merge pull request #1288 from AnalyticalGraphicsInc/ddrOpt

Minor DDR optimization
Fix whitespace.
Merge pull request #1295 from AnalyticalGraphicsInc/ddr

DDR changes
Merge branch 'master' into gltf