def register_instances(self, instances):
        if isinstance(instances, str) or isinstance(instances, unicode):
            instances = [instances]
        new_instances = self.connection.register_instances(self.name, instances)
        self.instances = new_instances
Adds instances to this load balancer. All instances must be in the same
dataset/ETHPy150Open darcyliu/storyboard/boto/ec2/elb/loadbalancer.py/LoadBalancer.register_instances