Added fs template loading fallback when a template is not found by id.
Added fs template loading fallback when a template is not found by id.

dave-irvine/twig.js,twigjs/twig.js,twigjs/twig.js,DethCount/twig.js,DethCount/twig.js,dave-irvine/twig.js,justjohn/twig.js,dave-irvine/twig.js,justjohn/twig.js,DethCount/twig.js,justjohn/twig.js,twigjs/twig.js