Add timeout to acknowledgdement handling

[mucaho]

In npm_crafty.matchmaking.js

ServerMatchmaker.prototype.notify = function(room, slot, socket, message, notifyCallback) {
    var self = this;

    var socketIds = Object.keys(room.takenSpots);
    var ackedIds = 0;
    for (var i = 0; i < socketIds.length; ++i) {
        self.sockets[socketIds[i]].socket.emit(message, slot, function(data) {
            ackedIds++;
            if (ackedIds >= socketIds.length) {
                console.log(message, "@", slot);
                notifyCallback(room.userData, socket, slot, room.openSlots);
            }
        });
    }
};

Two clients could disconnect at the same time, hence acknowledgement/callback-function for first client leaving will never get the required amount of ackedIds.
Add a timeout of ~1 sec before proceeding with sending notifications.