Use pure traversal rather than hybrid routing

[merwok]

It would be nice to use pure traversal for the view configs here (I mean view_config with context + name rather than route_name + factory + traverse for page list, view, edit). This would make this repo a nice, small example of traversal.

(Selfish request as I am re-learning traversal subtleties using wiki example from Pyramid docs, this repo (thanks!), a couple gists like https://gist.github.com/hadrien/8658263 and https://gist.github.com/hadrien/0efa49ca8837f948d63c and other resources)

Home and login would keep their routes and views.

[mmerickel]

I wrote the auth demo with routes / url dispatch in mind because I think pyramid's security system is way more obvious to understand when traversal is used on urls and it was not particularly clear how to do it with routes. I'd probably be willing to accept a branch or copy of one or two of the steps that use traversal as an example but wouldn't want to update the tutorial to handle that case.