改了4个前端的bug; 指定mongojs依赖项版本以杜绝不匹配问题, 自动更新socket.io的client的js文件来确保匹配

...cial urls; will not stop when pressing the stop button; can not input any string.

specify the version of the node module 'mongojs'
auto-update socket.io.js in client (/static/...) when 'make deploy'