Implement multiconfiguration

Multiconfiguration is needed for some CONFIG options (some of the "video:" ones in particular).
## Please ignore everything below this line.

If you don't plan to implement it can you help with a workaround?

``` javascript
var adrone = ardrone = require("ar-drone");

var drone = ardrone.createClient();

var UdpControl = drone._udpControl,
CmdCreator = UdpControl._cmdCreator,
CmdQueue = UdpControl._cmds;

var app_id = "JoyStickControl",
pro_id = "JoyStickControlP0",
ses_id = "JoyStickControlS0";

var pushCmd = function(type, args) {
cmd = CmdCreator.raw(type, args, false, {}, function(e){console.log(e)});
CmdQueue.push(cmd);
}

var pushAuthenticatedConfig = function(args) {
pushCmd("CONFIG_IDS", [app_id, pro_id, ses_id]);
pushCmd("CONFIG", args);
}

clearInterval(drone._interval);
drone._interval = null;

pushCmd("CONFIG", ["custom:application_id", app_id]);
pushCmd("CONFIG", ["custom:profile_id", pro_id]);
pushCmd("CONFIG", ["custom:session_id", ses_id]);
pushAuthenticatedConfig(["general:navdata_demo", "TRUE"]);
pushAuthenticatedConfig(["control:outdoor", OUTDOOR]);
pushAuthenticatedConfig(["control:flight_without_shell", SHELL]);
pushAuthenticatedConfig(["video:video_codec", "131"]); // 131 = H264_720P_CODEC

UdpControl.flush();

drone._setInterval(30);
```

The Drone ignores these commands or they don't get sent at all, I don't know.