Rollbacks #65
Description
CloudFormation, the lunatic it is, does not offer any kind of rollback functionality. So, I'll need to cache the generated templates in S3 to facilitate rollbacks.
The trick will be in allowing per-deployment rollbacks. I'll need to load the previous templates from S3, download the current template, merge the appropriate deployments in, and then push. This means I'll need to give each template an identifier and store with each deployment the current template it's deployed to.