20131122 remove system.exit(0)
Merge branch 'master' of github.com:liangxiaofei1100/ZhaoYanJuYou
20131122 clear TrafficStatics when quit application.
20131122 clear Log when quit application.
20131122 fix memory leak of MainActivity when activity is killed and recreat.
Merge branch 'master' of github.com:liangxiaofei1100/ZhaoYanJuYou