[keycloak-dev] persistence apis refactored

[Bill Burke]

I refactored the persistence apis into different maven modules.

Everything in services and in package org.keycloak.services.models has 
been broken up as follows

model/
      api/
      jpa/
      picketlink/

All top level interfaces are in api/.  Picketlink in picketlink. 
Package name has been switched to org.keycloak.models

This screwed up Viliam's pull request.
-- 
Bill Burke
JBoss, a division of Red Hat
http://bill.burkecentral.com