[3.0] Update required PHP to 5.5.9
[Debug] track and report deprecated classes and interfaces
Merge branch '2.7'

* 2.7:
  [Debug] track and report deprecated classes and interfaces
  [Form] Remove a redundant test.
  use value of DIRECTORY_SEPARATOR to detect Windows

Conflicts:
	src/Symfony/Bundle/SecurityBundle/Tests/Functional/SecurityRoutingIntegrationTest.php
	src/Symfony/Component/Security/Core/Util/SecureRandom.php