code: function stackParameters(name, changeSetType, templateUrl, parameters) {
    return {
      StackName: name,
      Capabilities: [
        'CAPABILITY_IAM',
        'CAPABILITY_NAMED_IAM'
      ],
      ChangeSetType: changeSetType,
      TemplateURL: templateUrl,
      Parameters: Object.keys(parameters).map(function(key) {
        return { ParameterKey: key, ParameterValue: parameters[key] };
      })
    };
  }
docs: Build parameters object for CloudFormation requests
  
  @private
  @param {string} name - the name of the stack
  @param {string} changeSetType - the type of changeset, either UPDATE or CREATE
  @param {string} templateUrl - the URL for the template on S3
  @param {object} parameters - name/value pairs defining the desired stack configuration
  @returns {object} params - an object for use in create/update/delete stack requests