Merge pull request #286 from goodfeli/master

More implementation of cuda convnet wrapper. More NORB support
visualization script for norb dataset
convenience link to Dropout class
input validation
fixed width of binocular weights viewer
unit test of image activations gradient
removed commented code
get_choice
Merge branch 'master' of github.com:lisa-lab/pylearn2
added min_class parameter to DenseDesignMatrix.convert_to_one_hot
yaml convenience functions
added restrict_instances parameter to FoveatedNORB
doc and training fold restriction for STL-10
checks of validity of InferenceProcedure's output
shrank test to make it work on GTX-285