Django-ultracache

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. Ensure a working error message if pika is not found.
. `cached_get` now considers any object accessed in get_context_data and not just objects accessed in the view template.
. The original request headers are now sent to the purgers along with the path. This enables fine-grained proxy invalidation.
. Django 2.0 and Python 3 compatibility. Django 1.9 support has been dropped.

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. Simplify the DRF caching implementation. It also now considers objects touched by sub-serializers.

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. The DRF settings now accept dotted names.
. The DRF setting now accepts a callable whose result forms part of the cache key.

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. Use pickle to cache DRF data because DRF uses a Decimal type that isn't recognized by Python's json library.

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. Adjust the DRF decorator so it can be used in more places.

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. Django Rest Framework caching does not cache the entire response anymore, only the data and headers.