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
Add better test for binary classification task
OPTIM vectorize decoding operation + FIX bug with binary classification task