Improved HTTP response when user not authenticated

Returning a HTTP redirect from login_required is designed for the web browser
and a human as the end-user; invite is used by JavaScript. Return an error
more suitable for the end-user.
Bumped version for next release
Document management commands

Fixes #1
Fix doc bug per #1
clarified topoff_invites
Merge https://github.com/eldarion/kaleo