scaffold Membership
respect namespacing
auto should only be set from hooks, not from web interface
fix new_link in index/show template for namespace
uniq syntax changed in  rails3
Wobauth.user_source: symbolized version of User class
relation group-membership-user
reflect namespacing
scaffold Authority
make polymorphic types for authority configurable
respect namespace
make polymorphic types selectable;

  _form is not complete yet, needs concrete selection and some
  javascript stuff.
complete model authority