Moved api guide from pylearn1
Remove unused KeyAwareDefaultDict class
Merge pull request #706 from memimo/doc

Moved api guide from pylearn1
Merge pull request #1043 from madisonmay/key-aware

Remove KeyAwareDefaultDict
Merge branch 'master' of https://github.com/lisa-lab/pylearn2
np.any(np.isnan(X)) --> np.isnan(np.min(X))