Contribution of pgsql support for AuthenticatorStore and UserService - Compatible with Play! 2.1 version

pgsql support for AuthenticatorStore provides persistent and clusterisable implementation.
Same for UserService. Pgsql support for UserService is based on Some(implementation) found on Play! mailing list, which was also submitted 3 month ago as a pull request.
SQL scripts are provided. Dependencies on anorm and jdbc are required.