Fixed ObjectHydrator when namespace alias is given.
[DDC-2256] Added test for hydrator.
[DDC-2256] Moved aliases translation to ResultSetMapping, fixed tests.
[DDC-2256] Code refactorization.
[DDC-2256] Code improvements.
Merge pull request #554 from beregond/hydrator-fix

Fixed ObjectHydrator when namespace alias is given.