Added the ReviewFollower model.
To be used to track who is subscribed to StudentProposals being reviewed. Or any other entity that uses the Review model to convey messages.
Patch by: Lennard de Rijk
Reviewed by: to-be-reviewed
<html>
<head><title>We ran out of time</title></head>
<body>
We ran out of processing time while serving your request, please try again.
</body>
</html>