The following example `serverless.yml` fails to deploy on localstack:

```yaml
service: "localtest"

provider:
  name: "aws"
  runtime: "nodejs10.x"

functions:
  hello:
    handler: "handler.hello"
    
resources:
  Resources:
    ApiGatewayRestApi:
      Type: "AWS::ApiGateway::RestApi"
      Properties:
        Name: "${self:provider.stage}-${self:service}"
    GatewayResponseDefault400:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "DEFAULT_4XX"
        ResponseTemplates:
          application/json: '{"errors":[{"message":"Custom text."}]}'
    GatewayResponseUnauthorized:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "UNAUTHORIZED"
        ResponseTemplates:
          application/json: '{"errors":[{"message":"Custom text!", "extra":"Some extra info"}]}'
    GatewayResponseDefault500:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "DEFAULT_5XX"
        ResponseTemplates:
          application/json: '{"errors":[{"message":$context.error.messageString}]}'
    GatewayResponseIntegrationTimeout:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        RestApiId:
          Ref: "ApiGatewayRestApi"
        ResponseType: "INTEGRATION_TIMEOUT"
        ResponseTemplates:
          application/json: '{"errors":[{"message":$context.error.messageString}]}'

plugins:
- "serverless-localstack"

custom:
  localstack:
    stages:
      - "local"
```

The error on the localstack end is `Exception: CloudFormation deployment for resource type ApiGateway::GatewayResponse not yet implemented`.
cloudformation = aws_stack.connect_to_service('cloudformation')
    response = cloudformation.describe_stack_resources(StackName=stack_name)
    for resource in response['StackResources']:
        if resource['LogicalResourceId'] == resource_logical_id:
            return resource
def list_stack_resources(stack_name):
    cloudformation = aws_stack.connect_to_service('cloudformation')
    response = cloudformation.list_stack_resources(StackName=stack_name)
    return response['StackResourceSummaries']
def get_queue_urls():
    sqs = aws_stack.connect_to_service('sqs')
    response = sqs.list_queues()
    return response['QueueUrls']
def get_topic_arns():
    sqs = aws_stack.connect_to_service('sns')
    response = sqs.list_topics()
    return [t['TopicArn'] for t in response['Topics']]
class CloudFormationTest(unittest.TestCase):
    def test_apply_template(self):
        cloudformation = aws_stack.connect_to_resource('cloudformation')
        s3 = aws_stack.connect_to_service('s3')
        sns = aws_stack.connect_to_service('sns')
        template = template_deployer.template_to_json(load_file(TEST_TEMPLATE_1))
        
        cloudformation.create_stack(StackName=TEST_STACK_NAME, TemplateBody=template)
        
        def check_stack():