[scikit-learn] 0.18?

[Olivier Grisel]

Ok I fixed all the 32 bit Linux & OSX build issues in scikit-learn
master and all wheels builds are green with the multibuild setup:

https://travis-ci.org/MacPython/scikit-learn-wheels

Matthew: would you be interested in having the multibuild repo
extended to also include appveyor configration files or do you think
it's better to let projects owner do their own appveyor config by
themselves?

-- 
Olivier