Move routes into a directory

[dkniffin]

With react-router v4, routes can live in multiple files. I think it'd be good to have a routes folder, with an index.jsx that is pretty much what the Routes.jsx file is now. Then, it can import other route files in that directory for sub-routes.

[leeallen337]

I like this idea and I'm doing this on roamd-fe. I'm adding it to https://github.com/smashingboxes/web-boilerplate/issues/64