Changed privates to protected and updated setUp to use late static binding. This allows projects using Doctrine2 to use its test cases for testing their own entities.

[2.0] Added support to IdentificationVariable that was missing in ArithmeticPrimary (it was not correctly handling it). Uncommented a unit test that added coverage to it.

[2.0] Fixed E_NOTICE being throwing when ->getSingleScalarResult() is called and no result is found. Added coverage for this and also for multiple result (NonUniqueResultException).

Fixing ensure-production-settings task to not throw an exception and instead use the Output object to output an error