Support for socket.io 1.0.x

This modification let the socket.io client connect with the 1.0.x version of socket.io and send and receive messages.
Some functionalities are still missing:
* Acknowledgement
* Binary event

It has been with the following setup:
```
[socket sendMessage:@"Hello world"];
    [socket sendMessage:@"{\"type\" : \"message sendWithout backslash\"}"];
    [socket sendMessage:@"{\\\"type\\\" : \\\"message sendWith backslash\\\"}"];
    [socket sendEvent:@"event" withData:@"{\"type\" : \"message sendWithout backslash\"}"];
    [socket sendEvent:@"event" withData:@"{\\\"type\\\" : \\\"message sendWith backslash\\\"}"];
    
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    [dict setObject:@"test1" forKey:@"key1"];
    [dict setObject:@"test2" forKey:@"key2"];
    
    [socket sendJSON:dict];
    [socket sendEvent:@"event" withData:dict];
```