Merge branch '2.8' into 3.2

* 2.8:
  updated VENDORS for 2.8.18
  fixed bad merge
  updated VENDORS for 2.8.18
  updated VENDORS for 2.7.25
  Add VarDumper's dump.php to autoload-dev

Author: fabpot

composer.json

@@ -8,7 +8,8 @@
         "classmap": [ "app/AppKernel.php", "app/AppCache.php" ]
     },
     "autoload-dev": {
-        "psr-4": { "Tests\\": "tests/" }
+        "psr-4": { "Tests\\": "tests/" },
+        "files": [ "vendor/symfony/symfony/src/Symfony/Component/VarDumper/Resources/functions/dump.php" ]
     },
     "require": {
         "php": ">=5.5.9",