[instanceOf] Resolve Doctrine entities to the real class name

[victorb]

Currently, when using instanceOf validator with Doctrine entities, it will always fail since Doctrine is using Proxy classes (See: http://docs.doctrine-project.org/en/2.0.x/reference/working-with-objects.html ). Is possible to get real class name by using ClassUtils::getRealClass (From: http://stackoverflow.com/a/14895345/360186 )

[vlucas]

I am not going to build something specific for a single project into Valitron. A possible solution here though is to allow for a closure as the class name instead of just a string or object. Then, you could create all that extra code that Doctrine requires yourself :p.