remove unused imports
Merge branch '2.3' into 2.4

* 2.3:
  Update validators.eu.xlf
  fixed CS
  remove unused imports
  Unify null comparisons
  [EventDispatcher] don't count empty listeners
  [Process] Fix unit tests in sigchild environment
  [Process] fix signal handling in wait()
  [BrowserKit] refactor code and fix unquoted regex
  Fixed server HTTP_HOST port uri conversion
  Bring code into standard
  [Process] Add test to verify fix for issue #11421
  [Process] Fixes issue #11421
  [DependencyInjection] Pass a Scope instance instead of a scope name.

Conflicts:
	src/Symfony/Component/EventDispatcher/Tests/EventDispatcherTest.php
removed some .gitattributes that should have been removed a lot time ago
Plural fix
Merge branch '2.3' into 2.4

* 2.3:
  Fixed relative redirects for ambiguous paths
  [BrowserKit] Fix browser kit redirect with ports
  [TwigBridge] [Form] Fixed some extra empty spaces
  Plural fix
  removed some .gitattributes that should have been removed a lot time ago
  [DependencyInjection] fixed missing 'factory-class' attribute in XmlDumper output
  fixed whitespace in Twig form template
  built-in server: exit when docroot does not exist

Conflicts:
	src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
Merge branch '2.4' into 2.5

* 2.4:
  Fixed relative redirects for ambiguous paths
  [BrowserKit] Fix browser kit redirect with ports
  [TwigBridge] [Form] Fixed some extra empty spaces
  Plural fix
  removed some .gitattributes that should have been removed a lot time ago
  [DependencyInjection] fixed missing 'factory-class' attribute in XmlDumper output
  fixed whitespace in Twig form template
  built-in server: exit when docroot does not exist

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/xml/services9.xml