User permissions added with test.

app/templates/error/403.html

@@ -0,0 +1,14 @@
+{% extends "withoutnav_template.html" %}
+{% block page_title %}Page not found{% endblock %}
+{% block maincolumn_content %}
+    <div class="grid-row">
+      <div class="column-two-thirds">
+        <h1 class="heading-large">
+          403
+        </h1>
+        <p>
+          You do not have permission to view this page.
+        </p>
+      </div>
+    </div>
+{% endblock %}