Don't hard-code trusted-advisor-refresh to us-east-1

Trusted Advisor is supported in GovCloud. This allows the refresh lambda to run in regions other than us-east-1 on AWS commercial.

v2.9: Merge pull request #55 from jayhding/optional-tag-key

Fixes a bug with the ami-cleaner tool that prevented it from handling untagged images correctly.

Thanks to @jayhding for the bugfix.

v2.8

This release adds the packer-janitor tool, which cleans up abandoned Packer instances and their associated resources.

Initial Release

Initial release with ebs-delete, rds-snapshot-cleaner, and s3-bucket-size