PIM-2317 : cosmetic
PIM-2317 : add ORM sorter for in_group
PIM-2317 : use in group filter in PQB (ORM)
PIM-2317 : fix CS
Merge branch 'master' into mongo/in_group_sorter
Merge branch 'master' into mongo/in_group_sorter
PIM-2317 : pass current group id in field param for sorting (should
be refactored)
PIM-2317 : add in group sorter (MongoDB ODM)
PIM-2317 : PQB uses in group sorter, update the product normalizer to
allow this operation
Merge pull request #958 from akeneo/mongo/in_group_sorter

[WIP] In group sorter (MongoDB support)