参考网址1:
http://www.cnblogs.com/qq78292959/archive/2012/07/16/2593651.html
参考网址2:
http://www.dozer.cc/2013/03/push-notifications-server-side-implement/
参考网址3:
http://www.dozer.cc/2013/06/ios-certificates-and-push-notifications-certificates/