ELB Healthcheck Intervals are too lax
We use the default HealthCheck when building ELBs, and those are far too lax. We might want to pull this into the extended procfile support.
http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/elb-healthchecks.html
This one got closed an accident from https://github.com/remind101/empire/pull/803, but very easy to change now.
Right now, the cloudformation stack doesn't specify any health checks, which means you can alter the health check by hand after the ELB is created (like before). I think it'd be good to wait for health checks to be defined in the extended Procfile before we add health checks to the CloudFormation stack, so that they can still be configured.