V0.3.0 rc

In order to support multiple databases you can't call ```data._id``` directly because most DBs don't use ```_id``` as the ID property.  The DAO layer support this abstraction by providing the field to ask for.  In this case you would say:
```
href: pb.UrlService.urlJoin('/admin/users/', data[pb.DAO.getIdField()])
```