Fix one of the migrations where column name was accidentally changed

[#79958812]
[#79977356] use capistrano autoscale to re-loadbalance after deploy

https://www.pivotaltracker.com/story/show/79977356

Undo Layout hack.

Cleanup gemfile.
Cowboy deployments are sometimes handy.
fix interactive urls in seeds
Configure production deployment to use autoscaling.
Update AutoScaling documentation.
Add Capistrano cowboy for the occasional needful test deploy.