Docs: generic celerybeat options should not write schedule to root owned directory.  Thanks to Nikos Fertakis.
Merge branch 'master' of github.com:celery/celery
Update task.py
Update tasks.rst
Merge pull request #1970 from dtheodor/master

Fix documentation for Task.throws
Merge branch 'master' of github.com:celery/celery
Merge pull request #1966 from mduggan/worker-heartbeat-option

Add option to worker to control heartbeat interval.
Try to fix CI tests
Make celery.five importable from outside.  Closes #1968
Fixes tests
Fixes test for #1964
Wording
Adds celery.version_info_t
Fix for QoS when using RabbitMQ 3.3 or later.  (Issue celery/kombu#339)