Add a cascade app for serving up wwwdocs files

Fixes GH #22
Generate absolute URIs with make_uri and co
Revert "Generate absolute URIs with make_uri and co"

This reverts commit 150f37d1e0d95ec1d5836178e367b2a515b789fe.
Add make_abs_uri
Display a page to the user for closed registration
Merge pull request #23 from hoelzro/master

Fix CSS and other wwwdocs resources on PSGI version
Add make_abs_uri
Display a page to the user for closed registration