hardened clean-users so that if it experiences an error deleting a user, it will continue to delete other users.
changed ec2 to only catch aws specific exceptions.
changed cloudpatrol to expect two responses from each call -- a list of successful actions, and a list of failures.
hardened iam calls against AWS failure.
hardened stop, start, terminate calls in ec2 against AWS failure.
made cleaning of elastic ips failure tolerant
made cleaning of default security group failure tolerant
add simplecov to do code coverage.
made cleaning of security groups failure tolerant