Allow to specify stack name as a parameter

www/bypass.html

@@ -12,6 +12,7 @@
             <form id="welcomeFormBypass" method="POST" action="/">
                 <button id="start" type="submit">Start Session</button>
                 <input id="stack" type="hidden" name="stack" value=""/>
+                <input id="stack_name" type="hidden" name="stack_name" value=""/>
             </form>
         </div>
     </body>
@@ -37,5 +38,9 @@
         if (stack) {
             document.getElementById('stack').value = stack;
         }
+        var stackName = getParameterByName('stack_name');
+        if (stack) {
+            document.getElementById('stack_name').value = stackName;
+        }
     </script>
 </html>