abbey.py - python script for creating AMIs in the VPC environment

abbey.py will launch an instance into a VPC, run ansible on it
and monitor it for updates using an SQS queue.  At the end of
the ansible run it will create an AMI and terminate the instance.
Merge pull request #549 from edx/jarv/abbey-ami

abbey.py - python script for creating AMIs in the VPC environment