def instantiate(params)
      instance = Instance.new( *interpolate(params), @parent )
      instance.apply_resource_type
      instance
    end
def instantiate(params)
      instance = Instance.new( *interpolate(params), @parent )
      instance.apply_resource_type
      instance
    end
Instantiate a new resource type with the given parameters.
 @param params [Hash] the parameters to interpolate in the resource type.
 @return [Raml::ResourceType::Instance] the instantiated resouce type.