Merge pull request #3 from zhangyaoxing/develop

- manage disconnect event. auto unsubscribe all events.
Merge branch 'master' of https://github.com/zhangyaoxing/SocketEvent
* fix "waiting for" bug.
* fix "waitinf for" feature.
- disable socketio log
- unsubscribe client when it's trying to reconnect. client will resubscribe when ready.