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/gallery/helpers/auth.php

@@ -46,7 +46,7 @@ class auth_Core {
       try {
         Session::instance()->destroy();
       } catch (Exception $e) {
-        Kohana::log("error", $e);
+        Kohana_Log::add("error", $e);
       }
       module::event("user_logout", $user);
     }