Merge branch '2.3' into 2.4

* 2.3:
  updated VERSION for 2.2.11
  update CONTRIBUTORS for 2.2.11
  updated CHANGELOG for 2.2.11
  Fixed typo in phpdoc
  Handled the scenario when no entity manager is passed with closure query builder.
  [HttpKernel] made a small optimization to Bundle initialization
  minor optimalization at bundle initialization
  [EventDispatcher] tweaked README
  removed observer pattern, in favour of mediator
  [DoctrineBridge] normalized class names in the ORM type guesser
  Fix `extract` method to avoid recalculating count() for each iteration.
  [Debug] ensured that a fatal PHP error is actually fatal after being handled by our error handler
  use the correct class name to retrieve mapped class' metadata and repository
  [WebProfilerBundle] Fixed js escaping in time.html.twig

Conflicts:
	src/Symfony/Component/Debug/ErrorHandler.php

Author: fabpot

Kernel.php

@@ -495,7 +495,9 @@ protected function initializeBundles()
         }
 
         // look for orphans
-        if (count($diff = array_values(array_diff(array_keys($directChildren), array_keys($this->bundles))))) {
+        if (!empty($directChildren) && count($diff = array_diff_key($directChildren, $this->bundles))) {
+            $diff = array_keys($diff);
+
             throw new \LogicException(sprintf('Bundle "%s" extends bundle "%s", which is not registered.', $directChildren[$diff[0]], $diff[0]));
         }