Django-celery-fulldbresult

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- Can now force JSON representation even if your task result is not JSON serializable.

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- Task results can be serialized with JSON instead of pickle.
- Task name in result was incorrect when celery reported a failure such as
hard time limit matched.
- Can override djcelery's PeriodicTaskAdmin to enable manual triggering of
PeriodicTask items with the Django Admin.

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- Tasks' ETA is now captured in the DB as well and presented in the admin by
default.

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- The order of choice fields are now fixed (sorted) so that migrations are not
re-generated depending on the version of Python or Django.

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- First release!
- Can store the parameters and enough meta in the task result to retry the task
- Integration with Django Admin: possible to retry a task from a task result
(admin action)