PIM-2317 : add a "dummy" but agnostic InGroup sorter
PIM-2317 : add the create query method used by group products grid
PIM-2317 : add a fake "in_group" property in product result record
PIM-2317 : add "fake" but agnostic in group filter
Merge branch 'master' into mongo/group_product_grid
Merge branch 'master' into mongo/group_product_grid
PIM-23-17 : temporary fix for in group sorter / filter
PIM-2317 : fix CS
Merge pull request #942 from akeneo/mongo/group_product_grid

Prepare the group products grid (MongoDB support)