ENH add sample_weight support to dummy classifier
ENH don't convert dataframes in grid search and cross-validation
Merge pull request #3418 from arjoly/dummy-weight

[MRG] ENH add sample_weight support to dummy classifier
DOC update what's new
DOC sample_weight attribute
FIX: Remove raw_coef_ attribute that eats up memory
Modified sparse OvR to handle sparse target data

Defaulted label binarizer to set sparse_output=True when training ovr
classifiers, edited Label binarizer to allow for sparse binary column output
DOC fix docstrings; add @hamsal to authors
Hardcode meta-estimator, make common tests pass
WIP start labelpowerset
WIP functional label power set
DOC label power set estimator
TST proper estimator type
FIX Label power set should work with custom estimator
ENH write narrative documentation of LabelPowerSetClassifier
TST add regression test for LabelPowerSetClassifier
ENH LabelPowerSetClassifier reference
DOC wording
ENH minor improbements
DOC COSMIT