DOC: update examples, use matplotlib.pyplot instead of pylab
peerindex testimonial
Merge pull request #2909 from ogrisel/peerindex-testimonial

[MRG] PeerIndex testimonial
FIX one more unchecked malloc in the tree code
DOC SVC.predict_{,log_}proba does not return X
DOC what we call poly features are called interaction features in stats
FIX OneHotEncoder: check value max when n_values is integral

Fixes #2839.