Fix for issue #14, in order for already initialized class to be loade…

…d as an Twig extension.

Views/TwigView.php

@@ -104,7 +104,8 @@ public function getEnvironment() {
                 Twig_Extensions_Autoloader::register();
 
                 foreach (self::$twigExtensions as $ext) {
-                    $this->twigEnvironment->addExtension(new $ext);
+                    $extension = is_object($ext) ? $ext : new $ext;
+                    $this->twigEnvironment->addExtension($extension);
                 }
             }
         }