Implemented CUDA backend and added CMake rules.
Merge branch 'master' of https://git.cern.ch/reps/VecGeom
Improving CMake for CUDA, linking with C++11 stuff. Some fiddling with old prototype stuff to get good results for Cilk, but not succeeding...
Merge branch 'master' of https://git.cern.ch/kerberos/VecGeom
implemented placement(template) specialized version of matrix multiplication; will speed up calculation of 'global' matrices
Merge branch 'master' of ssh://bitbucket.org/swenzel/fastgeom
Updated CMake. CUDA allowed to link with both GNU and Clang, and properly passes preprocessor flag to code.
Merge branch 'master' of https://git.cern.ch/reps/VecGeom
basic navigation facility
Merge branch 'master' of https://git.cern.ch/kerberos/VecGeom