adding Context.setCacheConfig. see here [1-2]. mac build.

[1] http://www.cs.cmu.edu/afs/cs/academic/class/15668-s11/www/cuda-doc/html/group__CUDA__EXEC_g40f8c11e81def95dc0072a375f965681.html#g40f8c11e81def95dc0072a375f965681
[2] http://developer.download.nvidia.com/compute/cuda/CUDA_Occupancy_calculator.xls
Merge branch 'master' of github.com:pcpratts/rootbeer1