2.4.0

Protocol

• Userid is now provided when requesting the hello endpoint with an Authorization
  header (#319)
• UUID validation now accepts any kind of UUID, not just v4 (fixes #387)
• Querystring parameter _to was renamed to _before (the former is now
  deprecated) (#391)

New features

• Cliquet Service class now has the default error handler attached (#388)
• Allow to configure info link in error responses with cliquet.error_info_link
  setting (#395)
• Storage backend now has a purge_deleted() to get rid of tombstones (#400)

Bug fixes

• Fix missing Backoff header for 304 responses (fixes #416)
• Fix Python3 encoding errors (#328)
• data is not mandatory in request body if the resource does not define
  any schema or if no field is mandatory (fixes Kinto/kinto#63)
• Fix no validation error on PATCH with unknown attribute (fixes #374)
• Fix permissions not validated on PATCH (fixes #375)
• Fix CORS header missing in 404 responses for unknown URLs (fixes #414)

Internal changes

• Renamed main documentation sections to HTTP Protocol and Internals (#394)
• Remove mentions of storage in documentation to avoid confusions with the
  Kinto project.
• Add details in timestamp documentation.
• Mention talk at Python Meetup Barcelona in README
• Fix documentation about postgres-contrib dependancy (#409)
• Add cliquet.utils to Internals documentation (#407)
• Default id generator now accepts dashes and underscores (#411)