Zc-zlibstorage

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- Add support for Python 3.6 and PyPy.

- Test with both ZODB/ZEO 4 and ZODB/ZEO 5.
Note that ServerZlibStorage cannot be used in a ZODB 5 Connection
(e.g., client-side, which wouldn't make sense :-]).
(https://github.com/zopefoundation/zc.zlibstorage/issues/5).

- Close the underlying iterator used by the ``iterator`` wrapper when
it is closed. (https://github.com/zopefoundation/zc.zlibstorage/issues/4)

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- Fixed an incompatibility with ZODB5. The previously optional and
ignored version argument to the database ``invalidate`` method is now
disallowed.

- Drop Python 2.6, 3.2, and 3.3 support. Added Python 3.4 and 3.5 support.

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- Python 3 support contributed by Christian Tismer.

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- Fixed a packaging bug.

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Initial release