Cliquet

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**Bug fixes**

- Add an explicit message when the server is configured as read-only and the
collection timestamp fails to be saved (ref Kinto/kinto558)

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**Bug fixes**

- Prevent the browser to cache server responses between two sessions. (593)

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**Bug fixes**

- Redirects version prefix to hello page when trailing_slash_redirect is enabled. (700)
- Fix crash when setting empty permission list with PostgreSQL permission backend (fixes Kinto/kinto575)
- Fix crash when type of values in querystring for exclude/include is wrong (fixes Kinto/kinto587)
- Fix crash when providing duplicated principals in permissions with PostgreSQL permission backend (fixes 702)

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**Bug fixes**

- Fix migration of triggers in PostgreSQL storage backend when upgrading from <3.0.0.
Running the ``migrate`` command will basically re-create them (fixes Kinto/kinto559)

**Documentation**

- Fix some typos in documentation (696)
- Update links to readthedocs (697)

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**Bug fixes**

- Fix safe creation (``If-None-Match: *``) if a record used to exist with the
same id (Kinto/kinto512)

**New features**

- A ``cache_prefix`` setting was added for cache backends. (680)

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**Bug fixes**

- Allow numeric comparison and sorting with the PostgreSQL backend. (690)