SINGA-139 Fixed a bug in built-in convolution layer
SINGA-139 Fixed a bug in built-in convolution layer

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