Changes

Code cleanup
 (commit: 2ecae39)

Composite key identifier policy : pushing responsibility to check for entity persistence status to the user, as for AlreadyAssignedIdentifierManager, because composite-key identifier is always an already-assigned policy.
Make possible to remove some TODO and weird ifs that check some identification type.
 (commit: be06bbd)

already-assigned identifier policy made better: implementing database check on persist(..). Valuable for composite-key entities but also for single-key ones.
Required a review of PersisterListener implementation: was made as a wrapper but this prohibits the override of persist(..) at persister level. Therefore, implementation is changed to inheritance for them.
 (commit: 893aa95)

Renaming Identification to SingleColumnIdentification
 (commit: aea89b8)

Adding organization prefix to generated Jar to make them more visible and avoid conflicts in packaged application (War, Ear, ...)
 (commit: 6527b89)