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

Http/Firewall/DigestAuthenticationListener.php

@@ -161,7 +161,7 @@ public function getResponse()
 
     public function getUsername()
     {
-        return strtr($this->elements['username'], array("\\\"" => "\"", "\\\\" => "\\"));
+        return strtr($this->elements['username'], array('\\"' => '"', '\\\\' => '\\'));
     }
 
     public function validateAndDecode($entryPointKey, $expectedRealm)