Merge branch '2.7'

* 2.7: (26 commits)
  removed Propel bridge from Symfony Core
  [2.7] Added deprecation warning for get request service in controller
  [Serializer] Normalizers can serialize collections and scalars
  [FrameworkBundle] Fix title and placeholder rendering in php form templates.
  [Process] added a deprecation notice
  [TwigBridge] Removed duplicated code from TwigRenderer
  [Translator][Logging] implement TranslatorBagInterface.
  RequestDataCollector - small fix
  renamed composer.phar to composer to be consistent with the Symfony docs
  [FrameworkBundle] bumped min version of Routing to 2.3
  removed composer --dev option everywhere
  fixed a test
  [Console] Fixed output bug, if escaped string in a formatted string.
  “console help” ignores --raw option
  Fix form icon position in web profiler
  [Security] Remove ContextListener's onKernelResponse listener as it is used
  Revert "minor #12652 [HttpFoundation] [Hackday] #9942 test: Request::getContent() for null value (skler)"
  Revert "fixed assertion"
  fixed assertion
  [HttpFoundation] [Hackday] #9942 test: Request::getContent() for null value
  ...

Conflicts:
	composer.json
	src/Symfony/Bridge/Propel1/composer.json
	src/Symfony/Bridge/Twig/composer.json
	src/Symfony/Component/Console/Tests/Helper/LegacyTableHelperTest.php

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