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- Add support for Python 3.4, 3.5 and 3.6 and PyPy.
- Remove test dependency on ``zope.app.testing`` and
``zope.app.zcmlfiles``, among others.
- Change dependency on ``ZODB3`` to ``ZODB``.
- Remove the ability of ``ZopeVersion`` to parse information from a
subversion checkout. zope.app packages are in git now.