Added an error message in the DebugClassLoader when using / instead of \.
Merge branch '2.1'

* 2.1:
  [DependencyInjection] fixed the creation of synthetic services in ContainerBuilder
  [Security] PHPDoc in SecurityEvents
  Fix typos in README
  Added an error message in the DebugClassLoader when using / instead of \.
  KNOWN_ISSUES with php 5.3.16
  [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 2.1.8-DEV
  bumped Symfony version to 2.0.23-DEV

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Client.php
	src/Symfony/Component/HttpKernel/Kernel.php