PIM-2408 : add a ProductCategoryManager
PIM-2408 : update the CategoryExtension
PIM-2408 : update the category filter to use the product category
manager
PIM-2408 : move methods getProductCountByTree, getProductIdsInCategory,
getProductsCountInCategory
Merge branch 'master' into PIM-2408
PIM-2408 : move applyFilterByIds from product repo to product cateory
repo
PIM-2408 : move methods from product repo to product category repo
(MongoDB)
PIM-2408 : move methods from product repo to product cateory repo
(ORM)
PIM-2408 : define new repos as services
PIM-2408 : update ProductCategoryManager to use
ProductCategoryRepository
Merge branch 'master' into PIM-2408
PIM-2408 : fix cs
PIM-2408 : fix MongoDB ProductCategoryRepository
PIM-2408 : fix the use of class metadata in
ORM/ProductCategoryRepository
PIM-2408 : use prouct category manager to get the count by tree
Merge branch 'PIM-2408' of github.com:akeneo/pim-community-dev into PIM-2408
PIM-2408 : fix MongoDB ProductCategoryRepository
Fix CS
Merge pull request #1014 from akeneo/PIM-2408

PIM-2408 : add a ProductCategoryManager