Added templates for http exceptions.

dav_events/templates/error_base.html

@@ -0,0 +1,17 @@
+{% extends "dav_events/base.html" %}
+{% load bootstrap3 %}
+
+{% block head-title %}{% block error-code %}{% endblock %} {% block error-title %}Error{% endblock %} - {{ block.super }}{% endblock head-title %}
+
+{% block page-container %}
+	<div class="panel panel-danger">
+		<div class="panel-heading">
+			<h1>{% block error-heading %}Error{% endblock %}</h1>
+		</div>
+		<div class="panel-body">
+			{% block error-body %}
+			<p>Irgendwas ist hier falsch gelaufen.</p>
+			{% endblock %}
+		</div>
+	</div>
+{% endblock page-container %}