added default scene to tutorial07
Merge branch 'devel' of https://github.com/embree/embree into devel
changing render mode in tutorial07 resets accumulation mode
ambient occlusion mode working for tutorial07
fixed wrong assertion in avxb.h
bugfix in tutorial07_ispc, iteration over pixels was wrong
bugfix in jpeg.cpp, multiple i++ in same statement produce undefined result
added rtcSetErrorFunction API call
all tutorials set error handler
Merge branch 'devel' of https://github.com/embree/embree into devel