feat(contrib) Spin up an ELB

This still allows you to connect directly to the instances behind the ELB on port 80, 2222. We should think about moving away from that, and using the ELB as the entry point. This would greatly simplify the configuration differences between a VPC, and non-VPC environment. Right now, all the instances will be out of rotation until you finish a `make run`.

Thanks to @daanemanz for the guidance on CloudFormation.

Fixes #1139
True, but that means that you're communicating to the cluster via a public IPV4. Ultimately we should be using the private IPV4 addresses between the cluster and the load balancer. In that case, the first and second ingress rules are obsolete.