------------------
- Add support for Python 3.4, 3.5, 3.6 and PyPy.
- Fix the ``evolve`` view to use independent transactions instead of
committing or aborting the thread-local current transaction.
- Drop dependency on ``zope.app.renderer``.
- Drop test dependency on ``zope.app.testing``, ``zope.app.zcmlfiles``
and others.