Move specialized (pretty) url generation back into Item_Model so that

we're not relying on overriding url::site() to do tricks around item
urls.  This means that you won't get item urls by doing
url::site("albums/37"), for example, but it also means that we won't
get pretty urls where we don't expect them (like in the action of a
<form> element).

Incidentally, this will help us move over to using the slug format
because if you've got a bad character in a url, the edit forms will
now work on it since they'll be id based.

modules/gallery/controllers/quick.php

@@ -121,7 +121,7 @@ class Quick_Controller extends Controller {
       print json_encode(array("result" => "success", "reload" => 1));
     } else {
       print json_encode(array("result" => "success",
-                              "location" => url::site("albums/$parent->id")));
+                              "location" => $parent->url()));
     }
   }