Merge branch '2.6' into 2.7

* 2.6:
  [Routing][DependencyInjection] Support .yaml extension in YAML loaders
  [DX] improve file loader error for router/other resources in bundle
  [FrameworkBundle] Initialize translator with the default locale.
  [FrameworkBundle] Fix Routing\DelegatingLoader resiliency to fatal errors
  [2.6][Translation] remove duplicate code for loading catalogue.
  [HttpKernel] Cleanup ExceptionListener
  CS fixes
  [DependencyInjection] Show better error when the Yaml component is not installed
  [2.3] SCA for Components - reference mismatches
  [Debug] Scream as LogLevel::DEBUG (but for fatal errors / uncaught exceptions)
  [2.3] Static Code Analysis for Components
  [WebProfilerBundle] Fix resiliency to exceptions thrown by the url generator
  [Translation] LoggingTranslator simplifications
  [Translation][fixed test] refresh cache when resources are no longer fresh.
  [FrameworkBundle] Fixed server:start --router relative path issue #14124
  [FrameworkBundle] improve usage of Table helper
  [Validator] Added missing Simplified Chinese (zh_CN) translations
  [FrameworkBundle] Workaround php -S ignoring auto_prepend_file

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
	src/Symfony/Component/Console/Helper/Table.php
	src/Symfony/Component/Translation/LoggingTranslator.php

Author: nicolas-grekas

Tests/Iterator/IteratorTestCase.php

@@ -51,7 +51,7 @@ protected function assertOrderedIteratorForGroups($expected, \Traversable $itera
         foreach ($expected as $subarray) {
             $temp = array();
             while (count($values) && count($temp) < count($subarray)) {
-                array_push($temp, array_shift($values));
+                $temp[] = array_shift($values);
             }
             sort($temp);
             sort($subarray);