Merge pull request #8497 from jbradish/master
Merge branch 'jbradish-master'
COMPAT: matplotlib 1.4.0 version compat (GH8502)
Merge pull request #8504 from jreback/mpl_fix

COMPAT: matplotlib 1.4.0 version compat (GH8502)
CI: add appveyor support
Merge pull request #8500 from jreback/appv

WIP/CI: add appveyor support
DOC: merging.rst changes