Prepares the roomMap to be JSONified. That is: convert the non
        JSON serializable objects such as set()

def prepare_roomMap(roomMap):
    """ Prepares the roomMap to be JSONified. That is: convert the non
        JSON serializable objects such as set() """
    ret = {}
    for room in roomMap:
        ret[room] = [roomMap[room].name, list(roomMap[room].pcs)]
    return ret