[Checkins] [zopefoundation/BTrees] f4531e: Use macpython everywhere. (#62)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/BTrees
  Commit: f4531e4bf722f5892246335e6037d6bee24bc292
      https://github.com/zopefoundation/BTrees/commit/f4531e4bf722f5892246335e6037d6bee24bc292
  Author: Jason Madden <jason+github at nextthought.com>
  Date:   2017-01-18 (Wed, 18 Jan 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Use macpython everywhere. (#62)

* Use macpython everywhere.

Add 3.6 for mac.

See zopefoundation/persistent#59

* Manually install persistent for travis.

* plain pypy3 is python 3.2 which won't run newer setuptools