PIM-2035 : introduce a sorter service for flexible field
PIM-2035 : add a logic exception when a sorter is not well configured
PIM-2035 : use sorter service for attribute types in product grid
PIM-2035 : update sorter configurator to replace apply_callback use by
sprter service
Merge branch 'master' into refactor/grid_flexible_sorter
PIM-2035 : update flexible field sorter to change product repository
alias
Merge pull request #792 from akeneo/refactor/grid_flexible_sorter

[WIP] Refactor/grid flexible sorter