http://www.2cto.com/kf/201405/299487.html
http://blog.csdn.net/lyq8479/article/details/26104667
http://www.cnblogs.com/txw1958/p/wechat-tutorial.html
http://mp.weixin.qq.com/wiki/index.php?title=通用接口文档
http://sae.sina.com.cn/doc/tutorial/concept.html#pv-uip