removed files from whitelist
removed unused import
factored out handling of batch size, made DefaultTrainingAlgorithm do it
right
fixed all long lines in all files I modified
made SGD docstring follow the standard
Merge pull request #678 from goodfeli/tim

Fix issues encountered by Tim Hang
added test that RBM train_batch call works
restored old SGD optimizer
cleaned up recently restored SGDOptimizer code
Merge pull request #679 from goodfeli/tim2

Fix more issues encountered by Tim Hang
Merge remote-tracking branch 'upstream/master'

this merge is necessary,
added set_biases method to GaussianVisLayer and removed unnecessary comments