2.2.0

• Fix task repr (refs #460).
• Adds task-id into metadata for task exceptions (refs #461).
• Ensure database connection is not closed when using the call_local method of Django helper extension db_periodic_task().
• Allow pickle protocol to be explicitly configured in serializer parameters.
• Adds FileHuey and full FileStorage implementation.
• Add shutdown() hook, which will be run in the context of the worker threads/processes during shutdown. This hook can be used to clean-up shared or global resources, for example.
• Allow pipelines to be chained together. Additionally, support chaining task instances.

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