PIM-1557 Removing relation between Category and Product
PIM-1557 Move repository action related to product category relationship to ProductRepository
Merge branch 'master' into mongodb/PIM-1557

Conflicts:
	src/Pim/Bundle/CatalogBundle/Entity/Repository/ProductRepository.php
PIM-1557 Remove unused method
PIM-1557 Add BC note on changelog
PIM-1557 Fixes Unit test
Fixed validation error on empty metrics
Repaired metric import
Fixed attribute option guesser
Merge branch 'master' into mongodb/PIM-1557

Conflicts:
	src/Pim/Bundle/CatalogBundle/Entity/Repository/ProductRepository.php
Fixed empty metric importing
Clean up fixturescontext
Merge branch 'master' into mongodb/PIM-1557
Clean up fixturescontext
Behat cleanup
Added possibility to override validation
Fixed unit test
removed useless file
Corrected validation not applied
PUM-1557 Change category fixtures loading when product provided to category