* Add cloudformation support to AWS::ECS::Cluster
* Add CloudFormation support to AWS::ECS::TaskDefinition
* Add CloudFormation support to AWS::ECS::Service
* Add support to update AWS::ECS::Cluster through CloudFormation
* Fix Cluster.update_from_cloudformation_json to return original_resource if nothing changed
* Implement TaskDefinition.update_from_cloudformation_json
* Implement Service.update_from_cloudformation_json