[OPENENGSB-3603] added tests to EDBConverterTest and EDBIT for cascading...

... models

so as it turns out, cascading and recursion with models does in fact work and no changes were required [1]

however i wrote some more rigorous tests for this, so we can safely refactor the EDBConverter according to OPENENGSB-2719 [2].

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[1]: http://issues.openengsb.org/jira/browse/OPENENGSB-3603
[2]: http://issues.openengsb.org/jira/browse/OPENENGSB-2719