Update web.js

Disconnecting Clients and Updating all other clients
Update chat.js

Disconnecting Clients and Updating other clients (online users)
Update chat.css

Message time
Disconnecting Users

Using socket.on('disconnect', function(){}) to disconnect the users.
Disconnecting Users and Updating other clients

Disconnecting Users and Updating other clients. 
Adding a time-stamp to a message.
Updating CSS for disconnected users and time-stamp
Merge pull request #1 from jc17/master

Disconnecting Clients