Pages: Figure out a way to do the middleware 404 handling without mucking with env['PATH_INFO']

[TylerRick]

As it is, if you inspect request.path from your app, it will return relatively useless information such as:

/k3cms_pages/2
/k3cms_pages/not_found

As a workaround for now, we are setting request.env['ORIG_PATH_INFO'] so that the app at least has some way of seeing what the original path was...