Examples:
require "right_aws_api"
cfm = RightScale::CloudApi::AWS::CFM::Manager::new(key, secret, 'https://cloudformation.us-east-1.amazonaws.com')
cfm.DescribeStacks {"DescribeStacksResponse"=>
{"@xmlns"=>"http://cloudformation.amazonaws.com/doc/2010-05-15/",
"DescribeStacksResult"=>{"Stacks"=>nil},
"ResponseMetadata"=>{"RequestId"=>"363a6f90-4f60-11e2-a5b9-17ce5ae131c1"}}}
cfm.DescribeStacks('StackName' => 'MyStack')
cfm.EstimateTemplateCost('TemplateURL' => 'https://s3.amazonaws.com/cloudformation-samples-us-east-1/Drupal_Simple.template')