Examples:
require "right_aws_api"
eb = RightScale::CloudApi::AWS::EC::Manager::new(key, secret, 'https://elasticache.us-east-1.amazonaws.com')
eb.DescribeCacheClusters {"DescribeApplicationsResponse"=>
{"@xmlns"=>"http://elasticbeanstalk.amazonaws.com/docs/2010-12-01/",
"DescribeApplicationsResult"=>{"Applications"=>nil},
"ResponseMetadata"=>{"RequestId"=>"b7c61b5a-4f69-11e2-a3d0-a772ddd49d31"}}}
eb.DescribeCacheSubnetGroups {"DescribeCacheSubnetGroupsResponse"=>
{"@xmlns"=>"http://elasticache.amazonaws.com/doc/2012-11-15/",
"DescribeCacheSubnetGroupsResult"=>{"CacheSubnetGroups"=>nil},
"ResponseMetadata"=>{"RequestId"=>"ae3546cb-4f6e-11e2-b196-0b589a77da67"}}}