adding /arch:AVX2 to embree_avx2 project
properly selecting AVX2 under Windows
updated readme
added Compiling for Xeon Phi section to readme
added resoruce.h
updates to webpage
Merge branch 'v2.3.3' of https://github.com/embree/embree into v2.3.3
compile fix for ISPC v1.8.0