[keycloak-dev] refactored model for caching

I'm almost done with a caching implementation. Had to do some refactoring though * Some methods were moved from RealmModel to ClientModel and UserModel. scope mapping methods, role mapping methods, stuff that really belonged * I moved a lot of queries up to the KeycloakSession interface. The reason I did this is so that a caching layer could make queries without having to do a DB query to load a realm, app, client, or whatever. I wanted to commit this stuff now as I changed a lot of files and didn't want tons of merge conflicts after you guys get back. Hopefully I can have a cache working in the next few days. -- Bill Burke JBoss, a division of Red Hat http://bill.burkecentral.com