Added utility to skip tests if running on Travis
FIX #3372: unstable input check test for RANSACRegressor
Added FIXME annotation to skipped test
Merge pull request #3353 from kastnerkyle/skip_ompcv_travis

[MRG+1] Skip test for OrthogonalMatchingPursuitCV if running on Travis
Corrected two typos in docstring.
#3356 - Added an exception raising when np.nan is passed into a HashingVectorizer.
#3356 - Added an exception raising when np.nan is passed into a HashingVectorizer.
Merge pull request #3375 from ldirer/hashing_fix3356

Corrected two typos in docstring.
Added a test on hashing vectorizer behavior with np.nan input.
PEP8 line length fix.
Changed solver from 'dense_cholesky' to 'cholesky' to eliminate deprecation warning.
MAINT ensure that examples figures are displayed in the correct order
MAINT: more explicit glob pattern in doc generation
Replaced assert_raises with assert_raise_message as the point is to make sure the exception message is clear.
Merge pull request #3378 from kastnerkyle/dense_cholesky_warnings

[MRG] Eliminate dense cholesky warning during tests
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.
Lift division out of loop in _isotonic_regression.

I'm surprised the C compiler doesn't do this, but it seems
to make a difference in the benchmarks.

Conflicts:
	sklearn/_isotonic.c
DOC: more readable whats_new
DOC: fix classes not referenced in docs