Refactoring, small improvements, and cleaning notation of IsotonicRegression
DOC more complete coverage of API linking in examples

Previously ignored non-plot files.

Avoids some link over/undergeneration
TST add test for name identification in RST generation
TST avoid nose running setup() in gen_rst.py
TST add sphinxext to testing
Changing docs from "vector" to "1d array"
TST remove dependencies for testing sphinxext
Added Windows Powershell download script
TST test interaction features outside doctest
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
DOC typo in FastICA docs