First Version

03/13/2013
Just create the client, server and serverSocket class.
Basic function:
Run server first, then run client, connect to server, then send message
to server and get the server reply message automatically.
This initial version supports multiple user to login to the server
simultaneously. I use the server thread to deal with each client user.
Version 0

Client, Server, ServerSocket classes.
Basic function:
Start server first, then start client create the connection with
server. From client send message to server, get server automatically
reply message.
This version support multiple users at the same time by using new
ServerThread to deal with each client.