New parameter resolver: AWS Systems Manager Parameter Store

New features:

• parameter_store resolver:
  You can now store your sensitive parameters using the AWS Systems Manager Parameter store, see https://github.com/envato/stack_master/blob/v1.2.0/README.md#parameter-store for more details.

NOTE:
Has a bug:
The version number has not been bumped to match the tag, this release will be superceeded shortly.