update readme with mac os x build
update readme with mac os x build

hughperkins/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,hughperkins/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,hughperkins/DeepCL