Portier authentication Python helpers that are asyncio-aware

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asyncio-portier is a set of helpers for the Portier Identity Provider <https://portier.github.io/>. It is based on the portier-python package <https://pypi.python.org/pypi/portier-python> but modified to work with
:code:asyncio.

Usage

The helpers work in much the same way as the ones in portier-python. Check
the demos directory <https://github.com/vr2262/asyncio-portier/tree/master/demos>_ for usage
examples.

Notes

• portier-python doesn't seem to work quite right with Redis as the cache
  backend, so there are a few Redis-specific modifications. This may change in
  the future.
• I expected the calls to cryptographic libraries to be blocking, but I saw no
  improvement from running those calls in an :code:Executor as per
  https://docs.python.org/3/library/asyncio-eventloop.html#executor.