=head1 METHODS
-=over 4
-
-=item id
+=head2 id( )
A unique ID by which a user can be retrieved from the store.
-=item store
+=head2 store( )
Should return a class name that can be used to refetch the user using it's
ID.
-=item supports
+=head2 supports( )
An introspection method used to determine what features a user object has, to support credential and authorization plugins.
-=item
-
-=back
-
=cut
-