Allow multiple celeryd daemons, using symlinks and separate config files in sysconfig.
Removes global celery.events.state.state
rename EventDispatcher.copy_buffer -> extend_buffer
Statedb improvements
Fixes typo 1.1.0 -> 2.1.0.  Closes #1463
Merge pull request #1461 from aguinet/master

Add a BROKER_LOGIN_METHOD configuration directive
Documents BROKER_LOGIN_METHOD
graph cmd: exit_help no longer exists
Timer bootstep must start before Hub
Improves extending user guide
Must now pass app to Request
Must now pass app to Consumer
Must now pass app to WorkController
Must now pass app to Backend()
Tests passing
Adds Celery.setup_security
Fix crontab that use month of year and day of month

This patch fix the use of periodic tasks with
both month_of_year and day_of_month.

Before this patch, in July for a tasks that should
run in February, the periodic task run again and
again. Celery believes it is 5 months late when
it is 7 month in advance.
flakes
Can now override type of Consumer.strategies (dict)
Fixes typo in canvas guide.  Closes #1464