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As it gives quite some headaches when supporting multiple versions of Doctrine2, I decided that from 0.16 on, the minimum version of Doctrine2 will be 2.2.0.
Also a check would be needed to inform the user if he uses anything higher than 2.2 (like 2.3) that potential issues can occur.
Added check for doctrine 2.2, relates to issue #151
This is implemented, closing.