Returns true if the template is still fresh.
string $name The template name:
timestamp $time The last modification time of the cached template:
Overrides Twig_LoaderInterface::isFresh
public function isFresh($name, $time) {
  $name = (string) $name;
  if (!isset($this->templates[$name])) {
    throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
  }
  return true;
}