Pull request #4 was inclomplete

[cganterh]

Pull request #4 was incomplete. Notifications should also be filtered by class.
The notifications should be filtered after they are imported in lines L12 and L13 of templates/boxes.html.

[pipegreyback]

Tried to fixed the issue adding line 14 as we discuss at the meeting, but an exception raised.

[cganterh]

That's because not all notification modules have the classes attribute.