make convolution and pooling operations picklable
make convolution and pooling operations picklable

bssrdf/cudarray,malzantot/cudarray,lre/cudarray,malzantot/cudarray,bssrdf/cudarray,rufrozen/cudarray,andersbll/cudarray,andersbll/cudarray,rufrozen/cudarray,rufrozen/cudarray,lre/cudarray