Added more complex NSPredicate and predicate builder #8
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Added predicateBuilder that create a NSPredicate from 3 parameters:
For example:
Using predicateBuilder I have improved findFirstOrCreateWithAttribute, now it works with all value and not only with strings
I have also added a new init method to allow the creation of more complex NSPredicate (the kind of firstCondition AND ( secondCondition OR thirdCondition)