use model assoc in most ctlr actions
add isadmin? filter
add User role, in_db helpers, index admin view, attempt guest login
fix create stock_ctlr bug, add girl_friday gem
add guestlog route, attempt current_user_or_guest method
add some specs for guestlog
add helpers isguest? authenticate_user_or_guest, use current_user_or_guest more
add sign_in guest_user; rm helpers current_user_or_guest, auth_user_or_guest