Trace: Must also find pickleable type
[->3.0] LimitedSet.purge must ignore KeyError
Attempting to resolve issue-1387 by first declaring local pid_file= to null in check_status()

Found that if _get_pid_files returns more than one file the local pid_files=`_get_pid_files` line 161 results in a bad variable name on ubuntu 12.04.
Fixed problem #1373 a unicode decode error caused by utf-8 characters in the platform
Should include cwd when importing custom loader
itermro: Forgot to yield value
[docs] Adds note that ETA/countdown tasks are not affected by prefetch limits.  Closes #1302
Updates Changelog for 3.0.20
Fixes broken example in task userguide (Issue #1357).

Probably haphazardly converted from `callback passing style` to using chains.
Always use mediator, emergency deadlock fix until 3.1
Tests passing
Update sqs.rst

Missing a trailing >
fix import error in python 2.5

3.0.x are the last versions to support python 2.5.  Erroneous import was introduced with a fix for issue #1107
[eventlet] Do not call blockdetection setup if no timeout set.   Closes #1408
celery control was not receiving replies
Now depends on kombu 2.5.11
Set release date for 3.0.20
Merge branch '3.0'

Conflicts:
	Changelog
	celery/apps/worker.py
	celery/bin/celery.py
	celery/task/trace.py
	celery/tests/worker/test_worker.py
	celery/utils/serialization.py
	celery/worker/__init__.py
	celery/worker/buckets.py
	celery/worker/mediator.py
	docs/userguide/tasks.rst
	requirements/default.txt
	setup.cfg