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`.
original_resource, new_resource_name, cloudformation_json, region_name):
        resource_name = cloudformation_json.get('Properties', {}).get('FunctionName') or new_resource_name
        return Lambda_create_from_cloudformation_json_orig(resource_name, cloudformation_json, region_name)
    if not hasattr(lambda_models.LambdaFunction, 'update_from_cloudformation_json'):
        lambda_models.LambdaFunction.update_from_cloudformation_json = Lambda_update_from_cloudformation_json
    
    def depl_delete_from_cloudformation_json(
            resource_name, resource_json, region_name):
        properties = resource_json['Properties']
        LOG.info('TODO: apigateway.Deployment.delete_from_cloudformation_json %s' % properties)
    if not hasattr(apigw_models.Deployment, 'delete_from_cloudformation_json'):
        apigw_models.Deployment.delete_from_cloudformation_json = depl_delete_from_cloudformation_json
    
    def vers_delete_from_cloudformation_json(
            resource_name, resource_json, region_name):
        properties = resource_json['Properties']
        LOG.info('TODO: apigateway.Deployment.delete_from_cloudformation_json %s' % properties)
    if not hasattr(lambda_models.LambdaVersion, 'delete_from_cloudformation_json'):
        lambda_models.LambdaVersion.delete_from_cloudformation_json = vers_delete_from_cloudformation_json
    
    parsing.MODEL_MAP['AWS::ApiGateway::Deployment'] = apigw_models.Deployment
    parsing.MODEL_MAP['AWS::ApiGateway::Method'] = apigw_models.Method
    parsing.MODEL_MAP['AWS::ApiGateway::Resource'] = apigw_models.Resource
    parsing.MODEL_MAP['AWS::ApiGateway::RestApi'] = apigw_models.RestAPI
    parsing.MODEL_MAP['AWS::StepFunctions::StateMachine'] = sfn_models.StateMachine
    @classmethod
    def RestAPI_create_from_cloudformation_json(cls, resource_name, cloudformation_json, region_name):