Celery

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- Pool: Fixed "cannot join process not started" error.

- Now uses billiard.py2 and billiard.py3 specific packages that are installed
depending on the python version used.

This way the installation will not import version specific modules (and
possibly crash).

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- Fixed problem with our backwards compatible ``bytes`` wrapper
(Issue 103).

- No longer expects frozen applications to have a valid ``__file__``
attribute.

Fix contributed by George Sibble.

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- Fixes compatibility with Python < 2.7.6

- No longer attempts to handle ``SIGBUS``

Contributed by Vishal Vatsa.

- Non-thread based pool now only handles signals:

``SIGHUP``, ``SIGQUIT``, ``SIGTERM``, ``SIGUSR1``,
``SIGUSR2``.

- setup.py: Only show compilation warning for build related commands.

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- Fixed installation for Python 3.

Contributed by Rickert Mulder.

- Pool: Fixed bug with maxtasksperchild.

Fix contributed by Ionel Cristian Maries.

- Pool: Fixed bug in maintain_pool.

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- Fixed Unicode error when installing the distribution (Issue 89).

- Daemonic processes are now allowed to have children.

But note that it will not be possible to automatically
terminate them when the process exits.

See discussion at https://github.com/celery/celery/issues/1709

- Pool: Would not always be able to detect that a process exited.

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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