Get parents recursively

Summary

Entity.get_parents_recursively() did not work for unretrieved parents. Does work now. See #159 (closed).

Focus

• Does this solve the issue?
• Is the wrapped-entity mangling the correct way? (If not, how could tests against this look like?)

Test Environment

See pyinttests: pytest-3 -k recurs or pytest-3 tests/test_recursive_parents.py

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