PIM-2317 : implement the findByIds in MongoDB
PIM-2317 : use findByIds from the EntityToIdentifierTransformer if the
method exists in the repository
PIM-2317 : fix the addProduct method (MongoDBsupport)
PIM-2317 : update BindGroupProductsSubscriber to add the MongoDB
support, we need to update the added/removed products
PIM-2317 : push current group in the datagrid configuration
PIM-2317 : push the current group to the product hydrator
PIM-2317 : add a rule to display the "in group" property of a product
based on current group
PIM-2317 : fix spec of product hydrator spec
Merge branch 'master' into mongo/group_product_grid_part2
Merge pull request #948 from akeneo/mongo/group_product_grid_part2

Group product grid (MongoDB support)