Do not render responses for renderable interfaces, as will be handled…

… within the Cubex Response class, and gives getOriginalResponse, more meaning.

src/Kernel/CubexKernel.php

@@ -364,7 +364,7 @@ protected function _processResponse(
 
     if($value instanceof RenderableInterface)
     {
-      return new CubexResponse($value->render());
+      return new CubexResponse($value);
     }
 
     if(is_callable($value))