Added Random123 prng for mat generation

CMakeLists.txt

examples/async_IO_testbed.cpp

examples/include/Random123/MicroURNG.hpp

examples/include/Random123/ReinterpretCtr.hpp

examples/include/Random123/aes.h

examples/include/Random123/array.h

examples/include/Random123/ars.h

examples/include/Random123/boxmuller.hpp

examples/include/Random123/conventional/Engine.hpp

examples/include/Random123/conventional/gsl_cbrng.h

examples/include/Random123/features/clangfeatures.h

examples/include/Random123/features/compilerfeatures.h

examples/include/Random123/features/fujitsufeatures.h

examples/include/Random123/features/gccfeatures.h

examples/include/Random123/features/iccfeatures.h

examples/include/Random123/features/metalfeatures.h

examples/include/Random123/features/msvcfeatures.h

examples/include/Random123/features/nvccfeatures.h

examples/include/Random123/features/open64features.h

examples/include/Random123/features/openclfeatures.h