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* Adding support for multiple environments.
* Speeding up integration tests.
* Switching to CircleCI for continuous integration and deployment of documentation.
* Changing template S3 key to use a UTC timestamp rather than seconds since epoch.
* Changing update-stack-cs to delete the change set by default.
* Stopping appending region to template bucket name.
* Refactoring logger.
* Changing exception names from <Name>Exception to <Name>Error.
* Publishing development docs to http://sceptre-dev.ce-tools.cloudreach.com/.