enabled bvh4_builder2 also in SSE2 mode
modifications to documentation, MacOS -> Mac OS X
enabling new builder for motion blur geometry
bugfix in bvh8_builder2, bugfix in bvh8_intersector4_hybrid
Merge commit '972423f' into devel
adjusting cost of unaligned intersection to 1.5x AABB intersection cost
modified documentation, intersection filter no longer causes relevant performance impact
Merge branch 'devel' of https://github.com/embree/embree into devel