[3.0] Update required PHP to 5.5.9
[3.0] Removed some old hacks
[Form] Remove a redundant test.

This is exactly the same as testValidateTokenOnSubmitIfRootAndCompoundUsesTypeClassAsIntentionIfEmptyFormName().
[Debug] track and report deprecated classes and interfaces
feature #13164 [Debug] track and report deprecated classes and interfaces (nicolas-grekas)

This PR was merged into the 2.7 branch.

Discussion
----------

[Debug] track and report deprecated classes and interfaces

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

a541faf [Debug] track and report deprecated classes and interfaces
Merge branch '2.3' into 2.5

* 2.3:
  [Form] Remove a redundant test.
  use value of DIRECTORY_SEPARATOR to detect Windows

Conflicts:
	src/Symfony/Component/Console/Application.php
	src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
	src/Symfony/Component/Form/Tests/Extension/Csrf/Type/FormTypeCsrfExtensionTest.php
	src/Symfony/Component/Process/Process.php
Merge branch '2.5' into 2.6

* 2.5:
  [Form] Remove a redundant test.
  use value of DIRECTORY_SEPARATOR to detect Windows

Conflicts:
	src/Symfony/Component/Process/Process.php
Merge branch '2.6' into 2.7

* 2.6:
  [Form] Remove a redundant test.
  use value of DIRECTORY_SEPARATOR to detect Windows
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