Warning about JSONObject + missing <threadsafe>

[GoogleCodeExporter]

There are compile warning and deploy problem when used AppEngine 1.8.4:

1) "Use of com.google.appengine.repackaged may result in your app breaking 
without warning."

To resolve, in Game class must be following import replaced as showed:

- import com.google.appengine.repackaged.org.json.JSONObject;
+ import com.google.appengine.labs.repackaged.org.json.JSONObject;

This should be fixed in this demo app. Solution cames from:
https://stackoverflow.com/questions/8714790/cant-use-jsonobject-in-google-app-en
gine-java-anymore#answer-19131463

2) appengine-web.xml does not contain a <threadsafe>

To resolve must be added <threadsafe>true</threadsafe>

Original issue reported on code.google.com by honza...@gmail.com on 27 Feb 2015 at 3:32