Merge branch '2.1'

* 2.1: (24 commits)
  updated license year
  Update src/Symfony/Component/HttpFoundation/Response.php
  [Form] Fixed inheritance of "error_bubbling" in RepeatedType
  [Form] Fixed DateType when used with the intl extension disabled.
  [HttpFoundation] fix return types and handling of zero in Response
  [HttpFoundation] better fix for non-parseable Expires header date
  Fixed missing plural message in portuguese validator
  Fix Expires when the header is -1
  [DoctrineBridge] Allowing memcache port to be 0 to support memcache unix domain sockets.
  [Console] fixed unitialized properties (closes #5935)
  [Process] Prevented test from failing when pcntl extension is not enabled.
  Revert "[DoctrineBridge] Improved performance of the EntityType when used with the "query_builder" option"
  [Form] Fixed failing tests for DateTimeToStringTransformer.
  [Locale] Fixed the StubLocaleTest for ICU versions lower than 4.8.
  [Bundle] [FrameworkBundle] fixed typo in phpdoc of the SessionListener.
  [Form] Fixed test regression introduced in #6440
  [Tests] Fix namespaces
  Fixed php doc of GenericEvent::__construct
  HttpUtils must handle RequestMatcher too
  use preferred_choices in favor of preferred_query
  ...

Conflicts:
	src/Symfony/Bridge/Propel1/Form/ChoiceList/ModelChoiceList.php

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