`path.join` is way better for concating paths than doing it manually. It uses the correct path separator and you don’t have to deal with trailing slashes.

Maybe we can move whole `entryPath` part directly to the `ServerRouter`.

BTW: Before the `browserify` change merged into rendr we used in our project [browser-builtins](https://npmjs.org/package/browser-builtins) to require the `url` module on the client.