Zope.deferredimport

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- Add support for Python 3.5 and 3.6.

- Drop support for Python 2.6 and 3.3.

- Convert doctests to Sphinx documentation, including building docs
and running doctest snippets under ``tox``.

==================

- Add support for PyPy. PyPy3 support is blocked on release of fix for:
https://bitbucket.org/pypy/pypy/issue/1946

- Add support for Python 3.4.

- Add support for testing on Travis.

==================

- Add support for Python 3.3.

- Drop support for Python 2.4 and 2.5.

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- Add test extra to declare test dependency on ``zope.testing``.

==================

- Fix unit tests broken under Python 2.4 by the switch to the standard
library ``doctest`` module.

==================

- Prefer the standard library's ``doctest`` module to the one from
``zope.testing``.