rename home to game
login flow

1. implements Interceptor check login by User
2. register interceptor to redirect to LoginController
3. login by User and redirect back Gamecontroller
login func

1. request new session-id
2. save session-id/account pair in memcache
3. binding and validate LoginForm from request
4. show "Welcome, ${account}" at home
Merge branch '01-memcache'