udated README with firewall setup instructions

Author: mogar1980

appengine/standard/xmpp_wikibot/README.md

@@ -26,6 +26,15 @@ You should also download the [Google Cloud SDK](https://cloud.google.com/sdk/).
 It will allow you to access many of the features of Google Compute Engine via
 your local machine.
 
+**IMPORTANT** You must enable tcp traffic on port 5000 to send messages to the
+XMPP server. This can be done by running the following SDK commands:
+    gcloud config set project <YOUR PROJECT NAME>
+
+    gcloud compute firewall-rules create wikibot-server-rule --allow tcp:5000 --source-ranges=0.0.0.0/0
+
+Or you can create a new firewall rule via the UI in the 
+[Networks](https://console.cloud.google.com/networking/networks/list) section of
+the Google Cloud Console.
 
 ### Installing files and dependencies
 

appengine/standard/xmpp_wikibot/wikibot.py

@@ -55,7 +55,7 @@ def send_message():
     return 'message failed to send'
 
 def run_server():
-    app.run(threaded=False, use_reloader=False)
+    app.run(threaded=False, use_reloader=False, host='0.0.0.0')
 
 class UncycloBot(sleekxmpp.ClientXMPP):