Revert "Actually use Python 2.7 in win-py27 job (#70)"
Revert "Actually use Python 2.7 in win-py27 job (#70)"

This reverts commit 046f26363971ae1ddc9b4260cf17976480601652.

scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io,scikit-hep/scikit-hep.github.io