ENH: use partial sort for kneighbors selection
CLN: Fix typo
Merge pull request #3225 from bwignall/quickfix-typo

CLN: Fix typo
ENH: make trees work with very small max_features.

Trees do no longer fail if int(max_features*n_features) == 0, but use
max_features=1 if the max_features paramater was larger than 0.0

Fixes #3171.
TST skip flaky label propagation test

The optimization in 46aebf132b65e9a6c54b2747c864c6401cd5c56f broke
a test that relied on the exact ordering of k-NN in a test on a minute
dataset.
Implementation of logistic_regression_path.

This is mostly the code from Gael's logistic_cv branch. My work is only some
minor cleanup some added tests and benchmarking.
Take into account @agramfort's comments.

Only cosmetic changes.
Some fixes for LogisticCV object
Docstring of LogisticRegressionCV
Docstring
Refactor and some bug fixing
Docstring
FIX missing import
FIX: bug in LogisticRegressionCV
Make tests deterministic
FIX: coef.shape
Just to be sure
Add test
BUG when fit_intercept=False
Fallback for failing line search