Pgqueue

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* Speed up ``Event.tag_retry()``.

* Instances of ``Event`` are hashable.

* Preserve order of events on retry.

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* Log the reconnections.

* Single function call to retry any number of events.

* Lower memory usage.

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* Fix a bug with PgQ Ticker after January 18th, 2038.
Now it's safe until December 31st, 9999.

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* Ensure ``Event.retry`` is numeric, never ``None``.

* Reset the PgQ Ticker connection after a database outage.

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* First public release