PIM-2317 : fix the EntityToIdentifierTransformer
PIM-2317 : fix specs
Merge pull request #944 from akeneo/fix/entity_to_identifier

PIM-2317 : fix the EntityToIdentifierTransformer
Clean up RerefencedCollection by extending AbstractLazyCollection
Restore the initialized proprerty and related methods
Merge pull request #945 from akeneo/referencedcollection-cleanup

Clean up RerefencedCollection by extending AbstractLazyCollection
Merge branch 'master' into PIM-2287