start taking more advantage of class based views

templates/exam_update_form.html

@@ -4,8 +4,15 @@
     {{ form.media }}
 {% endblock %}
 
-{% block content %}
+{% block navigation %}
+    {{ block.super }}
+    {% if object %}
+        {% include object.get_link_headers %}
+    {% endif %}
 
+{% endblock navigation %}
+
+{% block content %}
     <h2>Update Exam</h2>
     <form action="" method="post">
         {% csrf_token %}