SINGA-136 Support cuDNN v4
SINGA-136 Support cuDNN v4

cudnn_convolution.cc: Add cudnn Vesrion Macro
Support cuDNN V4

venkatsatish/incubator-singa,wangsheng1001/incubator-singa,apache/incubator-singa,nusdbsystem/incubator-singa,apache/incubator-singa,venkatsatish/incubator-singa,nudles/incubator-singa,nusdbsystem/incubator-singa,ijingo/incubator-singa,wangsheng1001/incubator-singa,kaiping/incubator-singa,kaiping/incubator-singa,cac2003/incubator-singa,nusdbsystem/incubator-singa,apache/incubator-singa,nusdbsystem/incubator-singa,cac2003/incubator-singa,wangsheng1001/incubator-singa,nusdbsystem/incubator-singa,cac2003/incubator-singa,ijingo/incubator-singa,kaiping/incubator-singa,ijingo/incubator-singa,wangsheng1001/incubator-singa,nudles/incubator-singa,apache/incubator-singa,ijingo/incubator-singa,ijingo/incubator-singa,nudles/incubator-singa,venkatsatish/incubator-singa,cac2003/incubator-singa,nudles/incubator-singa,apache/incubator-singa,wangsheng1001/incubator-singa,venkatsatish/incubator-singa,kaiping/incubator-singa,kaiping/incubator-singa,nudles/incubator-singa