Kinto

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**Bug fixes**

- Use the ``KINTO_INI`` env variable to findout the configuration file. (1339)
- Fix ``create-user`` command for PostgreSQL backend (1340)
- Make sure ``create-user`` command updates password (1336)

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- Add a memcached cache backend (1332)

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- Failed to publish Kinto Admin

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**New features**

- Add a `create-user` kinto command (1315)

**Bug fixes**

- Fix pagination token generation on optional fields (1253)

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**Bug fixes**

- The PostgreSQL cache backend now orders deletes according to keys,
which are a well-defined order that never changes. (Fixes 1308.)

**Internal changes**

- Now all configuration options appear as commented lines on the configuration
template (895)
- Added task on PR template about updating the configuration template
if a new configuration setting is added.
- Use json instead of ujson in storage in tests (1255)
- Improve Docker container to follow Dockerflow recommendations (fixes 998)

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**Bug fixes**

- Fix bug in Postgres backend regarding the handling of combining
filters and NULL values.