Refactor loadConfig + readFromUrlGET params setup

[raulccabreu]

String params = "uuid="+uuid+"&device="+device+"&lang="+lang+"&country="+country
                    +"&manufacturer="+manufacturer+"&appId="+packageName+"&version="+versionName;
            if(DEBUG) Log.d(TAG, "Read from server URL: " + serverUrl + params);
            String serverConfig = readFromUrlGET(serverUrl, params, mConnectionTimeout, mReadTimeout);

This stackoverflow question below has many types of ways to improve this...

http://stackoverflow.com/questions/2959316/how-to-add-parameters-to-a-http-get-request-in-android