Cliquet

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- Revert ujson usage (132)

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**Bug fixes**

- Fix packaging (118)

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**New features**

- Add PostgreSQL connection pooling, with new settings
``cliquet.storage_pool_maxconn`` and ``cliquet.cache_pool_maxconn``
(*Default: 50*) (112)
- Add `StatsD <https://github.com/etsy/statsd/>`_ support,
enabled with ``cliquet.statsd_url = udp://server:port`` (114)
- Add `Sentry <http://sentry.readthedocs.io>`_ support,
enabled with ``cliquet.sentry_url = http://user:passserver/1`` (110)

**Bug fixes**

- Fix FxA verification cache not being used (103)
- Fix heartbeat database check (109)
- Fix PATCH endpoint crash if request has no body (115)

**Internal changes**

- Switch to `ujson <https://pypi.python.org/pypi/ujson>`_ for JSON
de/serialization optimizations (108)

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- Fix tests about unicode characters in BATCH querystring patch
- Remove CREATE CAST for the postgresql backend
- Fix environment variable override

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**Breaking changes**

- `cliquet.storage.postgresql` now uses UUID as record primary key (70)
- Settings ``cliquet.session_backend`` and ``cliquet.session_url`` were
renamed ``cliquet.cache_backend`` and ``cliquet.cache_url`` respectively.
- FxA user ids are not hashed anymore (82)
- Setting ``cliquet.retry_after`` was renamed ``cliquet.retry_after_seconds``
- OAuth2 redirect url now requires to be listed in
``fxa-oauth.webapp.authorized_domains`` (e.g. ``*.mozilla.com``)
- Batch are now limited to 25 requests by default (90)

**New features**

- Every setting can be specified via an environment variable
(e.g. ``cliquet.storage_url`` with ``CLIQUET_STORAGE_URL``)
- Logging now relies on `structlog <http://structlog.org>`_ (78)
- Logging output can be configured to stream JSON (78)
- New cache backend for PostgreSQL (44)
- Documentation was improved on various aspects (64, 86)
- Handle every backend errors and return 503 errors (21)
- State verification for OAuth2 dance now expires after 1 hour (83)

**Bug fixes**

- FxA OAuth views errors are now JSON formatted (67)
- Prevent error when pagination token has bad format (72)
- List of CORS exposed headers were fixed in POST on collection (54)

**Internal changes**

- Added a method in `cliquet.resource.Resource` to override known fields
(*required by Kinto*)
- Every setting has a default value
- Every end-point requires authentication by default
- Session backend was renamed to cache (96)

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- Update deleted_field support for postgres (62)