Added code to address issue #1403
In preprocessing.binarize, eliminate zeros from sparse matrices
Added feature for issue #1527
Minor PEP8 fixes for issue #1527
Minor docstring fix for issue #1527
Added tests and docs for normalized zero_one loss
Fixed pep8 spacing issue and floating point doctest issue
Checkout files from ndawe:treeweights
FIX: roll back some changes
FIX: what's new
flake8
sampling w/ replacement via sample_weights
ENH: early binding + allocate features at tree creation (by @pprett)
FIX: oob test
DOC: sample_weight=None
DOC: what's new
DOC: typo
DOC: cosmit
FIX: use sklearn.utils.fixes.bincount
ENH: use random_state.shuffle