Merge branch '2.3' into 2.5

* 2.3:
  [HttpFoundation] [Request] fix baseUrl parsing to fix wrong path_info
  [Twig][Bridge][TranslationDefaultDomain] add support of named arguments.
  [Form] Improved exception message if the data class is not found
  Fixes ArgvInput's argument getter with empty tokens
  execute cheaper checks before more expensive ones

Conflicts:
	src/Symfony/Component/Form/FormConfigBuilder.php

Author: fabpot

FormConfigBuilder.php

@@ -193,7 +193,7 @@ public function __construct($name, $dataClass, EventDispatcherInterface $dispatc
         self::validateName($name);
 
         if (null !== $dataClass && !class_exists($dataClass) && !interface_exists($dataClass)) {
-            throw new InvalidArgumentException(sprintf('The data class "%s" is not a valid class.', $dataClass));
+            throw new InvalidArgumentException(sprintf('Class "%s" not found. Is the "data_class" form option set correctly?', $dataClass));
         }
 
         $this->name = (string) $name;