updates to add a function to the interface

Author: brianpilati

src/RESTful/RESTfulInterface.php

@@ -42,6 +42,11 @@ public function setHeaderProperty($headerProperty);
      */
     public function getHeaderLocation();
 
+    /**
+     * @return string
+     */
+    public function getHeaderResponseCode();
+
     /**
      * @return string
      */