App.Group incorrectly builds paths on Windows machines

[schigh]

When creating routing groups (e.g. /api/v1/), the Group function uses the path.Join function. This function is using the path separator provided in the OS. This is causing grouped routes to fail on Windows machines (See image below)

A POC (working on my Windows builds) implementation of a fix is here:
schigh@c61f933

edit: I should also point out that this may affect the Resource functionality as it uses the filepath namespace, but I have not tested it as it's not in my use case.

[markbates]

It probably does affect the Resources stuff as well. Would you mind opening a PR for this?

[markbates]

I will very happily merge it!

[schigh]

No prob. I will do this after a few more sanity checks on my end.

[markbates]

Awesome! Thanks!

[schigh]

Verified paths are correct on Windows machine. PR to be sent.