Awscfncli

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.

Features:
- Improve stack and ChangeSet description command output format.
- Add the ability to display stack export/import values.
- Remove `--detail` option from stack describe subcommand.
- Add `--stack-resources` option to stack describe subcommand.
- Add `--stack-exports` option to stack describe subcommand.

Issues:
- Fix bug that TemplateBody failed to load template file.

Chore:
- Update keywords and description for SEO.

Issues:
- Fix conflict release version.