Mint cache

[ipmb]

Inspired by https://www.djangosnippets.org/snippets/155/ and borrowed from https://github.com/ericflo/django-newcache

• [x] test coverage
• [x] docs

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@8d0d7af). Click here to learn what that means. The diff coverage is 94.52%.

@@            Coverage Diff            @@
##             master       #4   +/-   ##
=========================================
  Coverage          ?   95.78%           
=========================================
  Files             ?        1           
  Lines             ?       95           
  Branches          ?       11           
=========================================
  Hits              ?       91           
  Misses            ?        3           
  Partials          ?        1

Impacted Files	Coverage Δ
django_ft_cache.py	95.78% <94.52%> (ø)

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