Decorator to tell Skal that the method/function is a command.

def command(func_or_args=None):
    """Decorator to tell Skal that the method/function is a command.

    """
    def decorator(f):
        f.__args__ = args
        return f
    if type(func_or_args) == type(decorator):
        args = {}
        return decorator(func_or_args)
    args = func_or_args
    return decorator