Set default momentum back to 0.
Compute normalization in layer activations by double-transposing.
Merge branch 'master' of github.com:lmjohns3/theano-nets
Merge branch 'master' of github.com:lmjohns3/theano-nets
Merge branch 'master' of github.com:lmjohns3/theano-nets
Refactor SGD trainer, and implement Nesterovs Accelerated Gradient for SGD with nonzero momentum.