alphagov / notifications-admin / 2365

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travis-ci

Sort template stats by usage

Template stats should show the most-used template first.

This commit:
- re-writes the `aggregate_usage` function to use `itertools.groupby`,
  which can do aggregation, and can return data in a structure that’s
  easy to sort on
- uses generators so that we’re not keeping lots of rows of template
  stats in memory

https://www.pivotaltracker.com/story/show/117348893

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