started writing tessellation code for hair
Merge branch 'master' of https://github.com/embree/embree
first part of hair tessellation - not yet emitting final segments
Merge branch 'master' of https://github.com/embree/embree
Merge branch 'master' of https://github.com/embree/embree
Merge branch 'master' of https://github.com/embree/embree
fix to README - 'cmake' should be 'ccmake'