DOC copyedit KernelCenterer docstring
DOC minimal kernel centering narrative docs
fix: newest numpy doesn't like all-indexing non-existing dimension (reported by erg #2233)
ENH remove bad examples
DOC let some example for prf metrics
Merge remote-tracking branch 'upstream/master'
FIX: Newer numpy causes scipy to issue a DeprecationWarning. Ignore it. Fixes #2234.
ENH allows make_multilabel_classification to return label indicator f…
TST grid_search_cv works with multioutput data
TST cross_val_score with multoutput data
FIX missing deprecation release information.

closes #2156
DOC recommend understanding NumPy in the tutorial
DOC expand feature selection docs with an example
DOC minor copyedit to FS docs

At the request of @amueller.
ENH: Add the hungarian algorithm
TEST: Increase testing of hungarian
MISC: cosmit in hungarian
ENH: Speed up in hungarian
ENH: More speedups in hungarian
ENH: More speedups in hungarian