Add notifyUrl and issuer fields to example app

Author: amacneil

example/views/request.twig

@@ -14,7 +14,7 @@ $response = $gateway->{{ method }}($params);</pre>
         <p>The following parameters are available. Not all options are required by all gateways.</p>
         <p><span class="label label-info">Note</span> Normally these parameters would be generated by your application and not set via form input.</p>
 
-        {% for key in ["amount", "currency", "description", "transactionId", "transactionReference", "cardReference", "returnUrl", "cancelUrl"] %}
+        {% for key in ["amount", "currency", "description", "transactionId", "transactionReference", "cardReference", "returnUrl", "cancelUrl", "notifyUrl", "issuer"] %}
 
             <div class="control-group">
                 <label class="control-label" for="params_{{key}}">{{ key }}</label>