Billiard

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- Windows: Fixed problem with missing ``WAITABANDONED_0``

Fix contributed by Matthias Wagner

- Windows: PipeConnection can now be inherited.

Fix contributed by Matthias Wagner

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- Temporary workaround for Celery maxtasksperchild issue.

Fix contributed by Ionel Cristian Maries.

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- Now also sets ``multiprocessing.current_process`` for compatibility
with loggings ``processName`` field.

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- Fixed compatibility with PyPy 2.1 + 2.2.

- Fixed problem in pypy detection.

Fix contributed by Tin Tvrtkovic.

- Now uses ``ctypes.find_library`` instead of hardcoded path to find
the macOS CoreServices framework.

Fix contributed by Moritz Kassner.

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- Now works without C extension again.

- New ``_billiard.read(fd, buffer, [len, ])`` function
implements os.read with buffer support (new buffer API)

- New pure-python implementation of ``Connection.send_offset``.

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- All platforms except for Windows/PyPy/Jython now requires the C extension.