[DependencyInjection] fixed the creation of synthetic services in ContainerBuilder
Merge branch '2.0' into 2.1

* 2.0:
  [DependencyInjection] fixed the creation of synthetic services in ContainerBuilder
  [Security] PHPDoc in SecurityEvents
  [FrameworkBundle] fixed Client::doRequest that must call its parent method (closes #6737)
  [Yaml] fixed ignored text when parsing an inlined mapping or sequence (closes #6786)
  [Yaml] fixed #6773
  [Yaml] fixed #6770
  bumped Symfony version to 2.0.23-DEV

Conflicts:
	src/Symfony/Component/DependencyInjection/ContainerBuilder.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Yaml/Inline.php
	src/Symfony/Component/Yaml/Tests/InlineTest.php