add an empty .awsbox.json - this allows one to clone and use awsbox's functionality not related to deployment
fix regression - deployment fails when -u is not specified
fix regression - addkey failed with files
minor refactor, remove redundant code, re-use .find command in destroy
execute duplicate code - add extractError(), combine .find and .describe, and add an optimization where when an image id is specified, we don't list all vms
changelog updates