please add support for underscore notation

[berteh]

Hello.

I'd like to load a package (Twig) that internally uses the underscore notation (eg Twig_Loader_Filesystem; Twig_LoaderInterface).

Could you please make this work in your loader ? That would be great as I cannot run Composer on my shared host provider. Or do you know any (php only) autoload alternative that does ?

Thanks for considering it. B.