TODOs
===
- [ ] Fix the increment id mapping bug
- [ ] Add timestamp before each msg
- [ ] Refactor user specifing by name rather than id, update whisper
- [ ] Finish :nick, check if the nick has been taken(config.serverName also can't be taken)
- [ ] Finsih /tap
- [ ] Add chat log subsystem
- [ ] Add account subsystem, such as same ip with same id

Add readme to log down TODOs.
Add readme to log down TODOs.
