PIM-3266: add Behat scenarios to detect the problem
PIM-3266: do not flush skipped items during an import
Merge branch 'PIM-3266-stable' into PIM-3266

Conflicts:
	features/export/export_attributes.feature
	src/Pim/Bundle/BaseConnectorBundle/Processor/CategoryProcessor.php
PIM-3266: set the ManagerRegistry as mandatory for the TransformerProcessor
PIM-3266: fix Behat scenarios broken during the merge from stable branch
Merge pull request #1673 from akeneo/PIM-3266

PIM-3266: do not flush skipped items during an import