readme update for CLBlast wrappers for gemv, saxpy, sscal
readme update for CLBlast wrappers for gemv, saxpy, sscal

hughperkins/cuda-on-cl,hughperkins/cuda-on-cl,hughperkins/coriander,hughperkins/coriander,hughperkins/cuda-on-cl,hughperkins/coriander,hughperkins/coriander,hughperkins/cuda-on-cl