Small DDR optimization by making the bounding volumes of draw commands in world coordinates.
Fix typo when setting 2D bounding sphere in Primitive.
Remove more instances of BoundingSphere.transform.
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
Merge branch 'ddr' into preprocess