Aws-cloudformation

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**Bugfixes**

- fix a bug that using s3 uri for ``TemplateUrl`` argument, it should use ``https://s3.amazonaws.com/${bucket}/${key}``

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**Minor Improvements**

- Add colorful console log.
- stablize the API.

**Bugfixes**

- raise exception explicitly when stack status is ``REVIEW_IN_PROGRESS``.

**Miscellaneous**

- Enrich documentation

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**Features and Improvements**

- First release
- Add :func:`~aws_cloudformation.deploy.deploy_stack`, similar to ``terraform plan`` and ``terraform apply`` combined API. Allow direct deploy or using change set
- Add :func:`~aws_cloudformation.deploy.remove_stack`, similar to ``terraform destroy``.

**Miscellaneous**

- total line of source code: 2168
- total line of test code: 329
- total line of code: 2497