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Based on the HTML5 websocket&canvas paint

Results 2 WebsocketPaint issues
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![image](https://cloud.githubusercontent.com/assets/27814025/26160732/a3a1adda-3b54-11e7-8c35-524dce39e0f2.png)

fixed problems. 1. username input dialog autoclose when click 'Go' 2. userlist select use username not socket.id 3. delete from userlist when disconnect