[keycloak-dev] JPA model committed

* I may have fucked up something as I had like 6 files in conflict when merging. * Relational model needs some fine tuning. Relied a lot on JPA defaults for schema creation * I remove any Picketlink dependencies in our codebase where appropriate. This involved creating a tiny SPI for our model backends: ModelProvider. I also had to fork these Picketlink classes: - Base32 - SHAPasswordEncoder - TimeBasedOTP * In the future, the testsuite directory should be made to run with multiple backends -- Bill Burke JBoss, a division of Red Hat http://bill.burkecentral.com