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/digibug/controllers/digibug.php

@@ -81,7 +81,7 @@ class Digibug_Controller extends Controller {
     }
 
     $proxy = ORM::factory("digibug_proxy", array("uuid" => $id));
-    if (!$proxy->loaded || !$proxy->item->loaded) {
+    if (!$proxy->loaded() || !$proxy->item->loaded()) {
       Kohana::show_404();
     }