Added a test on hashing vectorizer behavior with np.nan input.
PEP8 line length fix.
Replaced assert_raises with assert_raise_message as the point is to make sure the exception message is clear.
Additional skipping for omp_cv
Put check_travis in the correct place so that other tests are not skipped, and changed the CCA check to be more explicit.
FIX: check with tolerance on lars_path

Hopefully this will fix issue #3370 but I haven't checked.
Cosmetic np.abs -> abs
DOC Refreshed the documentation to install scikit-learn
TEST: metrics sample_weight test: almost_equal

The test was too strict and failing on certain boxes
Added additional skip checking for train and pickle tests
MAINT: skip some unstable transformers test under Win 32
MAINT configure Windows CI with appveyor.com
DOC various typos and fixes for the installation doc
DOC phrasing
Merge pull request #3381 from kastnerkyle/skip_omp_cv_regressors

[WIP] Skip common regressor test for OrthogonalMatchingPursuitCV on Travis
TST add test for minibatch k-means reassigns.
FIX bug where random state was reset in each call to partial_fit, such that reassignment either occured never or always.
FIX bug where distances were of illegal shape
FIX crash when to_reassign.sum() > X.shape[0]
TST split test for partial_fit and fit