web-server  pop.js error and client.js not found Pop

```
web-server/public/js/pop.js  format error
web-server/public/js/client.js  function tip " var pop=new Pop(title, tip);" not found Pop
function addUser or removeUser is not working 
```

[ chatofpomelo version after update ](https://github.com/xcyxiner/chatofpomelo)

```
repair pop.js format error
combine pop.js and client.js to client.js
index.html remove pop.js reference
```