Push Notifications

push notification 使用：

参考资源:

http://tiny4cocoa.com/thread-1406-1-1.html

http://bbs.ldci.com.cn/read.php?tid-19971.html

http://www.cocoachina.com/bbs/read.php?tid-3770-keyword-apns.html

http://code.google.com/p/apns-python-wrapper/

http://urbanairship.com/

http://urbanairship.com/docs/getting_started_ios_push.html