All but 2 of the new EntityManager.merge() tests are passing now.
Made the cascading merge test pass. Now to work on merging across plural attributes...
Fixed so null-valued collection attributes don't cause NPE during merge
Made cascading merge pass JPA rules 1-4 inclusive (tests for 5 and 6 still pending)
Renamed a few things after a quick walkthrough/review with csadilek
Added the remaining collection-valued merge tests, and made all the merge tests work with Hibernate
Added tests for JPA lifecycle events during merge operation
Added support for tracking removed entities. Allows merge test case 3 to pass