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
Branching 0.15.X to prepare the 0.15.0b1 release
Added Windows Powershell download script
TST test interaction features outside doctest
Minor fixes in the docs
Fix some fun column span alignment errors.
Reverting array X to vector x rename
Docstring addition and x->X
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