configuring MessageIntepolator when we are creating our ValidatorFactory
changing MessageInterpolatorFactory to avoid circular reference problem. now we can override MessageInterpoletorFactory to define the bundle to be used
ops, @lucascs says that Pico is nice and calls PostConstruct as expected
removing hack for Pico, since it calls PostConstruct as expected
we don't need to check null, since this method is only called once
Merge pull request #560 from nykolaslima/hibernate_validator_with_messages_properties

Change hibernate validation resource bundle default