Minor fixes in the docs
Fix some fun column span alignment errors.
Reverting array X to vector x rename
DOC fix deprecation in CD
DOC missing verb in README
Merge pull request #3260 from larsmans/cd-deprecation

[MRG] fix faulty deprecation in CD
DOC : clarify error message in _binary_roc_auc_score
TST silence spectral test/test warning message
FIX wrong parameter name in deprecation warning
Docstring addition and x->X
TST reduce max_depth for numerical stability
Merge pull request #3261 from larsmans/test-interaction-features

TST test interaction features outside doctest
removed unused variables and imports, add used imports where missing.
COSMIT TYPO
Stop using some deprecated interfaces.
DOC typo in FastICA docs
Merge branch 'pr/3263': minor fixes from the 0.15.X branch
MAINT: restore -git version in the master branch after the last release merge
Incorporating @ogrisel's comments for simplification
More simplifications