Added utility to skip tests if running on Travis
Fix labels of inliers vs outliers

At least based on what svm.OneClassSVM does in the example linked from this document, the description was wrong; labels actually assigned are 1/-1 for good/bad respectively, not 0/1.
fixed typo: diriclet -> dirichlet
Merge pull request #3368 from stevetjoa/typo-diriclet

fixed typo: diriclet -> dirichlet
DOC updated installation documentation

Added Canopy and Anaconda.
Removed EPD.
Merge pull request #3369 from NelleV/install_doc

DOC updated installation documentation
DOC: typo, envelop → envelope
Merge branch 'pr/3358'
MAINT Re-order argument to put deprecated one at the end
DOC: add transpose and intercept to formula of logistic regression
DOC adding return type and improving module doc
DOC return types in datasets.lfw
DOC numpydoc convention for Bunch-returning functions

Also cap lines at 80 chars, remove trailing spaces.

As suggested by @jnothman at
https://github.com/scikit-learn/scikit-learn/pull/3316/files#r14269818
Merge branch 'pr/3316'

Fixes #3316.
FIX multilabel deprecation warning in RidgeClassifierCV
MAINT ignore sparsefuncs_fast in diffs
FIX MinMaxScaler behavior on 1D inputs.
MAINT explicit float64 in sparsefuncs_fast
MAINT mailmap update
FIX #3372: unstable input check test for RANSACRegressor