PIM-1845 : introduce a custom variant group grid
Merge branch 'oro/grid' into PIM-1845
Merge branch 'oro/grid' into PIM-1845
PIM-1845 : comment out the custom variant group grid
PIM-1845 : fix indentation issue in datagrid
PIM-1845 : remove deprecated properties
Merge pull request #657 from akeneo/PIM-1845

[WIP] PIM-1845 : introduce a custom variant group grid