Merge branch '2.8' into 3.0

* 2.8:
  [2.7] Fix tests
  pass triggerDeprecationError arg to parent class
  remove default null value for asset version
  remove duplicated value
  [Ldap] Remove unused private property
  Update UPGRADE-3.0 with correct Voter details
  Change few occurences of a public setUp() method to protected
  [DependencyInjection] simplify the BC layer
  Change couple of occurences of a public setUp() method to protected

Author: fabpot

Tests/PropertyInfo/DoctrineExtractorTest.php

@@ -26,7 +26,7 @@ class DoctrineExtractorTest extends \PHPUnit_Framework_TestCase
      */
     private $extractor;
 
-    public function setUp()
+    protected function setUp()
     {
         $config = Setup::createAnnotationMetadataConfiguration(array(__DIR__.DIRECTORY_SEPARATOR.'Fixtures'), true);
         $entityManager = EntityManager::create(array('driver' => 'pdo_sqlite'), $config);