Updated mnist_conv_dnn example
Updated mnist_conv_dnn example

gabortakacs/Lasagne,DeanChan/Lasagne,Richi91/nntools,dnuffer/Lasagne,rlkelly/Lasagne,MihailoIsakov/fishfish,mheilman/Lasagne,kracwarlock/Lasagne,cancan101/Lasagne,ebattenberg/Lasagne,DataFighter/Lasagne-tutorial,diogo149/Lasagne,takacsg84/Lasagne,ErnstHowie/Lasagne