Adds dry run capability to improve testability.
From the Readme
Dry run
Hammertime has a dry-run feature for when you are not quite ready to unleash the hammer pants on your entire fleet of EC2s just yet. By setting HAMMERTIME_DRY_RUN to 'true', you enable dry-run in which hammertime does not touch your EC2s but will still log what it would have touched.