Dump Weight Callback

[samadejacobs]

It seems we change dump weight callback to save weights/biases at the end of each epoch. If that is true then we might not need the batch_interval parameter to the constructor and in the prototext file, @ndryden should please confirm.

[ndryden]

It wasn't a change-- it only ever saved data at the end of an epoch. This is a good catch though, we should clean up the unneeded code.

[samadejacobs]

Thanks for the clarification, we do the clean up as I encounter them.