Pyramid-zodbconn

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- Avoid aborting at the end of a request if there is no active transaction.
See https://github.com/Pylons/pyramid_zodbconn/pull/10

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- Open primary database using ``request.tm``, if present, as the transaction
manager. If not present, fall back to the default / global transaction
manager. Compatibility with ``pyramid_tm >= 0.11``, which allowed the
user to specify an explicit per-request transaction factory.
https://github.com/Pylons/pyramid_zodbconn/issues/6.

- Add support for Python 3.5 and 3.6.

- Drop support for Python 2.6, 3.2, and 3.3.

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- Change transfer log file format to include timestamp and elapsed time.

- Add ``zodbconn.transferlog_threshhold`` feature: only log transfers if
a request took > threshhold secs.

- Add ``docs`` section to tox.ini.

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- Add ``zodbconn.transferlog`` feature, which sends information about ZODB
storage loads and stores to a CSV file.

- Add ZODBConnectionOpened, ZODBConnectionWillClose, and ZODBConnectionClosed
events, which can be subscribed to.

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- Remove transitive dependencies of ``zodburi``.

- Add support for Python 3.2 / 3.3, and test them under ``tox``.

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- Configure database with ``ZODB.ActivityMonitor.ActivityMonitor``.