Preliminary work to cut over to Kohana 2.4

- Kohana::log() -> Kohana_Log::add()
- Kohana::config_XXX -> Kohana_Config::instance()->XXX
- Implement View::set_global in MY_View
- Updated Cache_Database_Driver to latest APIs
- ORM::$loaded -> ORM::loaded()
- Updated item::viewable() to use K2.4 parenthesization

modules/notification/helpers/notification.php

@@ -38,7 +38,7 @@ class notification {
       ->where("item_id", $item->id)
       ->where("user_id", $user->id)
       ->find()
-      ->loaded;
+      ->loaded();
   }
 
   static function add_watch($item, $user=null) {