Sspymgr

1. shadowsocks service interface completed, pyshadowsocks api can be called
2. user home page, admin home page
3. product and order subsystem

1. send email and signup verification, signup ui
2. basic unit tests
3. login and ui, session stored in database
4. optimize code structure, update shadowsocks controller

1. Use flask as Web App Framework
2. Finish some web interfaces
3. Create Database Manager Models