ELBs are now optional, do not require ELB for autoscale group
do not decrement autoscale group counts, json spec may be out of date
change ec2rotatehosts to prefer +1/-1 rotation if possible, over -1/+1 original method
Initial prototype, reports AMIs with no launch configs
Purging used AMIs

Attempts to purge AMIs for deletion that have known LCs using them.

Attempts to detect if any of the leftover AMIs ALSO have EC2 instances
currently allocated with them.
Reporting ec2 images that can be deleted