Allow users to list their notifications

This is in very early stage, but at least it works.

calsocial/templates/notifications.html

@@ -0,0 +1,7 @@
+{% extends 'base.html' %}
+
+{% block content %}
+{% for notif in notifs %}
+{{ notif.message }}<br>
+{% endfor %}
+{% endblock content %}