Properly support constraints expressed by bean validation (jsr303) annotations.

 * Access public method of package-visible TypeSafeActivator class without reflection.
 * Fix arguments to call of TypeSafeActivator.applyRelationalConstraints().
 * Use hibernate version 4.3.1.Final for all components.
 * Minor refactorings in exception handling.
Merge pull request #1 from aspargillus/master

Properly support constraints expressed by bean validation (jsr303) annotations.