PIM-2240: Implements missing methods for mass delete in mongo db
PIM-2240: Clean objectIdHydrator
PIM-2240: Remove limit for mass edit
PIM-2240: Add comments to explain code
Merge branch 'master' into PIM-2240
Merge pull request #923 from akeneo/PIM-2240

PIM-2240: Implements missing methods for mass delete in mongo db