Use DBUnit to implement database-based Golden Master

[stevenschwenke]

Instead of creating a Golden Master based on System.out.prints or Log-Statements, use the created database instead. DBUnit can export a given database to XML, which can act as a Golden Master.
Tasks:

• Write a simple example
• extend markdown-description with some refactorings that break or do not break the behavior. Proove with Golden Master.