Revert "BugFix #157. 

@UnitOfWork did not work when nested with @Transactional or other @UnitOfWork annotations."

This reverts commit c2d8e8f802cd54ecd75b7c87fc563d65b5c0c9e3.

Conflicts:
	ninja-core/src/site/markdown/developer/changelog.md
	ninja-servlet-jpa-blog-integration-test/src/test/java/controllers/BugReproductionControllerDocTesterTest.java