PIM-2589: Define attribute group "Others" in fixtures
PIM-2589: Render the attribute group mandatory in the attribute form
PIM-2589: Update CHANGELOG.md and UPDATE-1.2.md
PIM-2589: Remove the "Other" virtual group
PIM-2589: Avoid to delete an attribute group if it contains attributes
PIM-2589: Fix Behat scenarios
PIM-2589: Changer "Others" attribute group to "Other"
PIM-2589: Remove the virtual group
PIM-2589: Link an attribute to the default group when it's removed from a group
PIM-2589: Lock default attribute group, and find all attributes linked to the default group
PIM-2589: Fix Behat scenarios
PIM-2589: Addressing comments
PIM-2589: Specing AttributeGroupManager
Merge pull request #1160 from akeneo/PIM-2589

PIM-2589: Remove the virtual attribute group 'Other'