Implemented calculating Otsu value

src/c/Common/CHelpers.cpp

src/c/Common/CHelpers.h

src/c/Common/CudaProcessBuffer.cu

src/c/Common/CudaProcessBuffer.cuh

src/c/Common/CudaUtilities.cu

src/c/Common/CudaUtilities.cuh

src/c/CudaMex/MexCommand.cpp

src/c/CudaMex/MexCommand.h

src/c/CudaMex/OtsuThesholdValue.cpp