Some utils aditions

* Setting `force_refresh: true` prevent 304 on browser's cache on `$.SrBuj.Util.link`

* Links generated by `$.SrBuj.Util.link` have unique ids.

* There was a problem with the encoding on notify messages, now the message is decoded to UTF-8 by default and this feature can be disabled by setting `raw: true` on js_notify helper.

* Setting `remove: true` on js_notify helper will remove all notifications.

* By setting `time: -1` the notification will stick like a regular Rails flash message.

* Some tests