OGM-418 Upgrade wildfly to 8.CR1

I've upgraded the project to Wildfly 8 CR1 but this required the upgrade of Hibernate core to 4.3.Final.
The only issue I'vefound is that the method AbstractEntityPersister#postInstantiate() is now finale and cannot be overriden.

We needed to override it to avoid some null pointer exceptions and the only solution I've found is to initialized the variables with null values.