Added Windows Powershell download script
ignificant refactoring, will now automatically install Python, pip, and nose. Numpy and Scipy still require manual intervention
Fixed bug with append string getting double "_py_py"
Changed to using wheel packages for scipy and numpy, currently hosted on the sklearn Rackspace account.
Additional functions, ensuring pip is correct for python 3 and passing the proper path
Registry reloading is necessary the very first time Python is installed!
Fixed PATH issues for initial Python install environment
hange directory to $PYTHONHOME to avoid encodings error
hanging directories is *not* useful for the encoding error
Added longer delay after python silent install
dded verbose output when setting temporarily paths
Updated to include git, and install all python versions by default
Added a few new features, and an example of chocolatey-style install
Missing the r in powe(r)shell
FIX Forced dtype to int when densifying array in label_binarize
DOC Improve documentation of the olivetti dataset
DOC typos in feature_extraction.text

Fixes #3311.
small spelling error in doc
Merge pull request #3318 from abhishekkrthakur/master

small spelling error in doc
Merge pull request #3256 from kastnerkyle/windows_download_helper

[MRG+1] Windows Powershell script to automatically download Windows packages