crude hack to get ack callback on with socketio 1.0

I forked francoistemasys's great fork (it provides some socketio1.0 support) to add callback support to it. In the process I broke some 0.9 support (see comment in socketiopacket.m easy to fix)

https://github.com/francoisp/socket.IO-objc

Also, I just came accross this, linked on the socketio's ws but not ranking v high with google, it might be of interest if 0.9 support is not required: https://github.com/MegaBits/SIOSocket