Log Message:
Updated to latest release, 3.0.20. USE_LANGUAGES+=c; From ChangeLog:

3.0.20
======
:release-date: 2013-06-28 16:00 P.M BST

- Contains workaround for deadlock problems.

    A better solution will be part of Celery 3.1.

- Now depends on :ref:`Kombu 2.5.12 <kombu:version-2.5.12>`.

- Now depends on :mod:`billiard` 2.7.3.30

- ``--loader`` argument no longer supported importing loaders from the
  current directory.

- [Worker] Fixed memory leak when restarting after connection lost
  (Issue #1325).

- [Worker] Fixed UnicodeDecodeError at startup (Issue #1373).

    Fix contributed by Jessica Tallon.

- [Worker] Now properly rewrites unpickleable exceptions again.

- Fixed possible race condition when evicting items from the revoked task set.

- [generic-init.d] Fixed compatibility with Ubuntu's minimal Dash
  shell (Issue #1387).

    Fix contributed by monkut.

- ``Task.apply``/``ALWAYS_EAGER`` now also executes callbacks and errbacks
  (Issue #1336).

- [Worker] The :signal:`worker-shutdown` signal was no longer being dispatched
  (Issue #1339)j

- [Python 3] Fixed problem with threading.Event.

    Fix contributed by Xavier Ordoquy.

- [Python 3] Now handles ``io.UnsupportedOperation`` that may be raised
  by ``file.fileno()`` in Python 3.

- [Python 3] Fixed problem with qualname.

- [events.State] Now ignores unknown event-groups.

- [MongoDB backend] No longer uses deprecated ``safe`` parameter.

    Fix contributed by rfkrocktk

- The eventlet pool now imports on Windows.

- [Canvas] Fixed regression where immutable chord members may receive
  arguments (Issue #1340).

    Fix contributed by Peter Brook.

- [Canvas] chain now accepts generator argument again (Issue #1319).

- ``celery.migrate`` command now consumes from all queues if no queues
  specified.

    Fix contributed by John Watson.