Merge branch '2.8' into 3.0

* 2.8:
  updated VENDORS for 2.8.5
  dont hint the usage of the ApcuClassLoader anymore
  updated VENDORS for 2.8.4
  updated VENDORS for 2.7.11
  [app] updated PHPUnit configuration according to the current supported PHPUnit version.
  updated VENDORS for 2.3.39
  Change back to "serializer.mapping.cache.apc"
  updated VENDORS for 2.8.3
  updated VENDORS for 2.7.10
  updated VENDORS for 2.3.38

app/config/config_prod.yml

@@ -5,7 +5,7 @@ imports:
 #    validation:
 #        cache: validator.mapping.cache.doctrine.apc
 #    serializer:
-#        cache: serializer.mapping.cache.doctrine.apc
+#        cache: serializer.mapping.cache.apc
 
 #doctrine:
 #    orm:

phpunit.xml.dist

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!-- http://phpunit.de/manual/4.1/en/appendixes.configuration.html -->
+<!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.8/phpunit.xsd"
          backupGlobals="false"
          colors="true"
          bootstrap="app/autoload.php"

web/app.php

@@ -8,16 +8,6 @@
 $loader = require __DIR__.'/../app/autoload.php';
 include_once __DIR__.'/../var/bootstrap.php.cache';
 
-// Enable APC for autoloading to improve performance.
-// You should change the ApcClassLoader first argument to a unique prefix
-// in order to prevent cache key conflicts with other applications
-// also using APC.
-/*
-$apcLoader = new Symfony\Component\ClassLoader\ApcClassLoader(sha1(__FILE__), $loader);
-$loader->unregister();
-$apcLoader->register(true);
-*/
-
 $kernel = new AppKernel('prod', false);
 $kernel->loadClassCache();
 //$kernel = new AppCache($kernel);