Now with Dry Run

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.

:art: Restructure code base

Updates to node6.10
Significant restructure 
Better promise chaining
Modularize the code a bit more by breaking out into common functions
Move functionality into separate files, split by concern (start/stop, asg/instances)

Initial Release!

Power cycling EC2 instances & ASGs.