Refactor TokenHandler and rename to ResourceHandler
Refactor TokenHandler and rename to ResourceHandler

- Remove code refering to m.Resources from TokenHandler
- Move multipass.Resources field to email.UserService
- Remove claims.Resources field and dependant code
- Add new error ErrForbidden
- Rename TokenHandler to ResourceHandler
- Add set header Www-Authenticate when uthentication is missing

namsral/multipass