Removed unused use statements.
Merge branch '2.2' into 2.3

* 2.2:
  [DoctrineBridge] Loosened CollectionToArrayTransformer::transform() to accept arrays
  Removed unused use statements.
  Make usleep longer and simplify assertions
  Added japanese translation resource for security component.
  [Yaml] Fixed the escaping of strings starting with a dash when dumping
  Fix in ChainLoader.php
  fixed wrong started states
Fix docblock typo
Merge branch '2.2' into 2.3

* 2.2:
  [DoctrineBridge] Added type check to prevent calling clear() on arrays
  [Intl] Improved FormTypeCsrfExtension to use the type class as default intention if the form name is empty
  Fix docblock typo

Conflicts:
	src/Symfony/Component/Form/Extension/Csrf/Type/FormTypeCsrfExtension.php
Merge branch '2.3'

* 2.3:
  [DoctrineBridge] Added type check to prevent calling clear() on arrays
  [Intl] Improved FormTypeCsrfExtension to use the type class as default intention if the form name is empty
  Fix docblock typo