Cfncli

Features:
- Package referenced resources before deploying the template.
- Support deploying template with specified service role.

Issues:
- Fix unittest error.

Issues:
- Fix incorrect canned stack policies.

Features:
- Add "--execute" option to changeset create subcommand.

Issues:
- Fix Exception when describe a change set with resource change type is "Remove".

Features:
- Improve subcommand help.
- Add `template reflect` sub command which generated

Issues:
- Fix bug that `template validate` fails when `TemplateBody` is used.