add handling for multiple ELBs in app autoscale groups.  specifically for external+internal ELBs
Merge pull request #12 from WrathOfChris/cm-autoscale-multiple-elbs

add handling for multiple ELBs in app autoscale groups.  specifically fo...
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