aead support

1.aead cipher support
2.some optimize

1.1.0

1. optimize udp proxy
2. config file format change to json and support for multiple port and password
3. some bug fixed.

1.0.0

1.fixed a bug about udp server shutdown.
2.tcp proxy optimized.

0.9.0

vps 1core 512m， 程序占用内存在200-256m，运行时间一个月。