Updated to KH 3.3 and improved

includes/kohana/system/classes/Kohana/Config/Source.php

@@ -0,0 +1,14 @@
+<?php defined('SYSPATH') OR die('No direct script access.');
+/**
+ * Base Config source Interface
+ *
+ * Used to identify either config readers or writers when calling [Kohana_Config::attach()]
+ *
+ * @package    Kohana
+ * @category   Configuration
+ * @author     Kohana Team
+ * @copyright  (c) 2012 Kohana Team
+ * @license    http://kohanaphp.com/license
+ */
+
+interface Kohana_Config_Source {}