Kinto-fxa

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**Bug fixes**

- Make sure that caching of token verification nevers prevents from authenticating
requests (see Mozilla/PyFxA48)

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**Internal changes**

- Migrate schemas to Cornice 2 38

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**New features**

- Improve FxA error messages (fixes 1)

**Bug fixes**

- Optimize authentication policy to avoid validating the token several times
per request (fixes 33)

**Internal changes**

- Use Service from kinto.core (fixes 28)
- Make sure it does not catch Cornice 2 dependency (36)

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- Add the plugin version in the capability.

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**Breaking changes**

- Project renamed to *Kinto-fxa* to match the rename of ``cliquet`` to
``kinto.core``.

- Update to ``kinto.core`` for compatibility with Kinto 3.0. This
release is no longer compatible with Kinto < 3.0, please upgrade!

- With *Kinto* > 2.12*, the setting ``multiauth.policy.fxa.use`` must now
be explicitly set to ``kinto_fxa.authentication.FxAOAuthAuthenticationPolicy``

**Bug fixes**

- Fix checking of ``Authorization`` header when python is ran ``-O``
(ref mozilla-services/cliquet592)

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- Updated to *Cliquet* 2.9.0

**Breaking changes**

- *cliquet-fxa* cannot be included using ``pyramid.includes`` setting.
Use ``cliquet.includes`` instead.