added first relational mapping, mainly for Aukcja as Owner of relations

added first relational mapping, mainly for Aukcja as Owner of relations
added next relationships in model
added Uczestnik model class, to be continued
added next model relationships, first MANY_TO_MANY types
continuation of adding model relationships
added next model relationships
Merge pull request #2 from dawrut/basic_model_branch

Basic model branch in version rc