LearnBoost/socket.io — pull request #1337 by leeqiang (2013-11-07 06:50:03+00:00)
Title: custom handshake error message.

hi, guys
i have a scene, like:

```
return callback('COOKIE_ERROR', false) unless some_cookie

return callback('INVALID_USER', false) unless invalid_user_object
```
special handle by this error message.

such modifications, alright?