PIM-2256 : remove the useless default value listener
PIM-2256 : move initialize listener from flexible entity bundle
to catalog bundle
Merge branch 'master' into mongo/initialize_listener
PIM-2256 : remove deprecated spec
PIM-2256 : upgrade note
Merge pull request #901 from akeneo/mongo/initialize_listener

Default value listener + initializevalue listener (MongoDB support)