Create module::event() which runs Gallery events. It works by

convention.  To respond to the "photo_created" event in the gmaps
module, you create modules/gmaps/helpers/gmaps_event.php containing
class gmaps_event which has function photo_created.

Renamed all events from gallery.foo.bar to foo_bar
Updated tag module to use new convention.

modules/user/controllers/logout.php

@@ -21,7 +21,7 @@ class Logout_Controller extends Controller {
   public function index() {
     try {
       Session::instance()->destroy();
-      Event::run("gallery.user.logout", $user);
+      module::event("user_logout", $user);
     } catch (Exception $e) {
       Kohana::log("error", $e);
     }