added unit test verifying that not specifying dropout is same as setting
include prob to 1
refactored kl divergence for Sigmoid
allowed plotting with hours on the x axis
added more info to the environment variables essay
added a note about ipython version to the tutorials README
Merge branch 'master' of github.com:lisa-lab/pylearn2
remove file that was meant to have been moved to pylearn2.deprecated
added reference to train example (it was already in the class definition
too)
fix typo in error message
removed import of deprecated class
make Optimizer live on as _Optimizer
fix name
Merge pull request #197 from goodfeli/master

Small, miscellaneous