Fixed webpack config for windows

[AlwaysMoreHats]

Windows' local path separator is '' instead of '/', which is what the node modules use. When indexing the alias, using path.join will make it (e.g.) 'app\LoginForm' on Windows only instead of the correct alias 'app/LoginForm'

[AlwaysMoreHats]

You could instead do path.posix.join('app', name) in place of the interpolated string, but it won't remove windows separators from name if they exist. The safest way would be .replace('\\', '/') but because there are no sub routes and you only used the base name, it's not needed here. I think the interpolated string is the cleanest solution.

[mjackson]

Thanks, @AlwaysMoreHats! This is invaluable.