Merge branch '2.2' into 2.3

* 2.2:
  [Validator] fixed ConstraintViolation:: incorrect when nested
  handle Optional and Required constraints from XML or YAML sources correctly
  added missing comments to WebTestCase
  Fixed #8455: PhpExecutableFinder::find() does not always return the correct binary
  [DependencyInjection] Fix Container::camelize to convert beginning and ending chars
  [Validator] Fixed groups argument misplace for validateValue method from validator class

Conflicts:
	src/Symfony/Component/Validator/Tests/Constraints/CollectionTest.php
	src/Symfony/Component/Validator/Tests/GraphWalkerTest.php

Author: fabpot

Test/WebTestCase.php

@@ -13,7 +13,7 @@
 
 use Symfony\Bundle\FrameworkBundle\Client;
 use Symfony\Component\Finder\Finder;
-use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpKernel\KernelInterface;
 
 /**
  * WebTestCase is the base class for functional tests.
@@ -23,6 +23,10 @@
 abstract class WebTestCase extends \PHPUnit_Framework_TestCase
 {
     protected static $class;
+
+    /**
+     * @var KernelInterface
+     */
     protected static $kernel;
 
     /**
@@ -147,7 +151,7 @@ protected static function getKernelClass()
      *
      * @param array $options An array of options
      *
-     * @return HttpKernelInterface A HttpKernelInterface instance
+     * @return KernelInterface A KernelInterface instance
      */
     protected static function createKernel(array $options = array())
     {