livereload fail while not running on localhost

[Leo Yu Ho Lo]

Hi, thanks for this great work. It helps a lot for learning angular 2. I cloned this repository and try to run gulp serve, everything goes well except livereload. I figured out the reason, it is because I am running it inside vm, and view it with browser running on the host machine. It makes the http://localhost:35729/livereload.js assumption to fail.

I try to change localhost to window.location.hostname, and it works. May I submit a pull request, in case someone like me running it outside localhost may encounter the same problem?

[Gábor Soós]

thanks, merged it, works fine