Merge branch '2.7' into 2.8

* 2.7:
  [VarDumper] Fix missing support for dumping PHP7 return type
  [travis] disable symfony_debug ext when deps!=no
  Do not normalize the kernel root directory path (see symfony/symfony#15474).
  Don't trigger deprecation on interfaces
  [Debug] Ignore silencing for deprecations
  [ci] Run minimal versions on appveyor only
  Fix appveyor file
  consistently use str_replace to unify directory separators (remaining)

Author: fabpot

Tests/Functional/SetAclCommandTest.php

@@ -106,7 +106,7 @@ public function testSetAclRole()
         $setAclCommandTester = new CommandTester($setAclCommand);
         $setAclCommandTester->execute(array(
             'command' => 'acl:set',
-            'arguments' => array($grantedPermission, sprintf('%s:%s', strtr(self::OBJECT_CLASS, '\\', '/'), $objectId)),
+            'arguments' => array($grantedPermission, sprintf('%s:%s', str_replace('\\', '/', self::OBJECT_CLASS), $objectId)),
             '--role' => array($role),
         ));