Can't Register Own IUrlModifier

[thefringeninja]

I would like to be able to register a IUrlModifier so I can throw all this behind a CDN. Unfortunately this is not possible because due to WebHost:

  base.ConfigureContainer();

  Container.Register<IUrlModifier>((c, p) => new UrlModifier(getContext));
  Container.Register<IUrlGenerator>((c, n) => new UrlGenerator(c.Resolve<IUrlModifier>(), UrlModifier.CassettePrefix));

I can get around this by ignoring CassetteNancyStartup and reimplementing my own but that's no fun!