Add authentication support

use Catalyst qw/...
                Authentication
               /;

__PACKAGE__->config->{authentication} =
 {
  default_realm => 'openid',
  realms => {
             openid => {
                        credential => {
                                       class => 'OpenID',
                                       use_session => 1,
                                      },
                        store => {
                                  class      => 'DBIx::Class',
                                  user_class => 'DBIC::Users',
                                  id_field   => 'uid',
                                 }
                       }
            }
 };