Add support for ImagineBundle >2.0

Author: tobias-93

Twig/Extension/ImageAssetsExtension.php

@@ -82,9 +82,15 @@ public function filter()
         $path = $params[0];
 
         if ('liip_imagine' === $this->getImageManipulator()) {
+          if(class_exists('\Liip\ImagineBundle\Templating\ImagineExtension')) {
             $ext = new \Liip\ImagineBundle\Templating\ImagineExtension(
                 $this->container->get('liip_imagine.cache.manager')
             );
+          } else {
+            $ext = new \Liip\ImagineBundle\Templating\FilterExtension(
+                $this->container->get('liip_imagine.cache.manager')
+            );
+          }
 
             return call_user_func_array(array($ext, "filter"), $params);
         }