RTGOV-161: simply db configuration
           using @PersistenceContext to inject the EntityManager.
Added transactional interceptor to test managing txn scope around activity server impl methods
Merge branch 'rtgov-161' of git://github.com/jeffyu/rtgov into RTGOV-175
RTGOV-175 Apply CDI transactional interceptor on top of RTGOV-161 db simplification work - currently transactional annotation and interceptor defined with activity server impl, but needs to be moved to common module (RTGOV-176)