利用VpnService实现http代理，
基于madeye的github项目BaoLianDeng,
BaoLianDeng
仅供学习使用，并不实用，
只是简单删除原项目中没用的东西，剩下http代理，
首次启动会要求输入地址，支持http代理认证，比如，
http://user1:pass1@192.168.2.10:2082
Use VpnService to implement http proxy,
Based on madeye's github project BaoLianDeng,
BaoLianDeng
For learning purposes only, not practical,
Just simply delete the useless things in the original project, leaving the http proxy,
The first start will ask for an address, Support http proxy authentication, for example,
http://user1:pass1@192.168.2.10:2082