[keycloak-dev] JPA model committed

[Bill Burke]

* 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