Merge branch '2.3' into 2.6

* 2.3:
  [Routing][DependencyInjection] Support .yaml extension in YAML loaders
  [DX] improve file loader error for router/other resources in bundle
  [FrameworkBundle] Fix Routing\DelegatingLoader resiliency to fatal errors
  [HttpKernel] Cleanup ExceptionListener
  CS fixes
  [DependencyInjection] Show better error when the Yaml component is not installed
  [2.3] SCA for Components - reference mismatches
  [2.3] Static Code Analysis for Components
  [Translation][fixed test] refresh cache when resources are no longer fresh.
  [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/Config/Exception/FileLoaderLoadException.php
	src/Symfony/Component/Console/Descriptor/TextDescriptor.php
	src/Symfony/Component/Console/Helper/TableHelper.php
	src/Symfony/Component/Console/Tests/Formatter/OutputFormatterTest.php
	src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
	src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
	src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
	src/Symfony/Component/HttpKernel/Tests/Debug/TraceableEventDispatcherTest.php
	src/Symfony/Component/PropertyAccess/PropertyAccessor.php
	src/Symfony/Component/Yaml/Tests/InlineTest.php

Extension/CodeExtension.php

@@ -58,7 +58,7 @@ public function abbrClass($class)
         $parts = explode('\\', $class);
         $short = array_pop($parts);
 
-        return sprintf("<abbr title=\"%s\">%s</abbr>", $class, $short);
+        return sprintf('<abbr title="%s">%s</abbr>', $class, $short);
     }
 
     public function abbrMethod($method)
@@ -67,9 +67,9 @@ public function abbrMethod($method)
             list($class, $method) = explode('::', $method, 2);
             $result = sprintf('%s::%s()', $this->abbrClass($class), $method);
         } elseif ('Closure' === $method) {
-            $result = sprintf("<abbr title=\"%s\">%s</abbr>", $method, $method);
+            $result = sprintf('<abbr title="%s">%s</abbr>', $method, $method);
         } else {
-            $result = sprintf("<abbr title=\"%s\">%s</abbr>()", $method, $method);
+            $result = sprintf('<abbr title="%s">%s</abbr>()', $method, $method);
         }
 
         return $result;
@@ -89,7 +89,7 @@ public function formatArgs($args)
             if ('object' === $item[0]) {
                 $parts = explode('\\', $item[1]);
                 $short = array_pop($parts);
-                $formattedValue = sprintf("<em>object</em>(<abbr title=\"%s\">%s</abbr>)", $item[1], $short);
+                $formattedValue = sprintf('<em>object</em>(<abbr title="%s">%s</abbr>)', $item[1], $short);
             } elseif ('array' === $item[0]) {
                 $formattedValue = sprintf('<em>array</em>(%s)', is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
             } elseif ('string' === $item[0]) {