Added option to bulk create vouchers via the WebUI.

Closes #9

community_backup/webui/templates/admin/bulk_generate.html

@@ -0,0 +1,8 @@
+{% extends "admin/base_site.html" %}
+{% block content %}
+  <form method="post">
+    {% csrf_token %}
+  {{ form }}
+    <input type="submit" value="submit">
+  </form>
+{% endblock %}

community_backup/webui/templates/admin/voucher_change_list.html

@@ -0,0 +1,6 @@
+{% extends "admin/change_list.html" %}
+
+{% block object-tools-items %}
+  {{ block.super }}
+<li><a href="{% url 'admin:voucher_bulk_generate' %}" class="addlink">Bulk Generate Vouchers</a></li>
+{% endblock %}