Celery

--------------------

- Fix a crash when handling a timeout.
- Improve billiard.einfo.Frame compatibility with Python to avoid crashes when using Django.
- Cleanups.

--------------------

- Fix rebuild_ctype losing BufferedWrapper reference on Python 3.
- Deprecation warning with python 3.6 fixed.
- Correct spawn start method.

--------------------

- Adds Process._authkey alias to .authkey for 2.7 compat.
- Remove superfluous else clause from max_memory_per_child_check.
- Document and test all supported Python versions.
- Extend 'Process' to be compatible with < Py3.5.
- Use a properly initialized logger in pool.py error logging.
- _trywaitkill can now kill a whole process group if the worker process declares itself as a group leader.
- Fix cpython issue 14881 (See https://bugs.python.org/issue14881).
- Fix for a crash on windows.
- Fix messaging in case of worker exceeds max memory.

--------------------

- max_memory_per_child was measured in kilobytes on Linux, but bytes on
*BSD/MacOS, it's now always kilobytes.

- Windows: Adds support for max_memory_per_child, but requires the
``psutil`` package to be installed.

- Fixed bug in ForkingPickler.loadbuf, where it tried to pass
a BytesIO instance directly to ``pickle.loads`` on Python 2.7.

--------------------

- Connection: Properly handle EINTR (Issue 191).

- Fixed bug with missing CreateProcess for Windows on Python 2.7.

- Adds Process._counter for compatibility with Python <3.5.

--------------------

- No longer supports Python 2.6

You need Python 2.7 or later to use this version of billiard.

- Merged changes from CPython 3.5