PIM-2602 : add abstract media
PIM-1602 : add abstract metric
PIM-2602 : add abstract product price
PIM-2602 : use abstract models in product value to allow the override
Merge branch 'master' into PIM-2602_abstract_models
PIM-2602 : add abstract association
Merge branch 'master' into PIM-2602_abstract_models
Merge branch 'master' into PIM-2602_abstract_models
PIM-2602 : use AbstractAssociation as method argument to replace the use
of Association
Merge branch 'master' into PIM-2602_abstract_models
PIM-2602 : update MongoDB normalizers to be able to deal with abstract
classes
Merge branch 'master' into PIM-2602_abstract_models
Replace some "==" by "==="
Replace "!=" by "!==" operator
Remove useless test for orm extension
Update phpdoc
Merge branch 'master' into operator_cleanup
Merge pull request #1106 from akeneo/remove_test_orm

Remove useless test for orm extension
Merge pull request #1104 from akeneo/operator_cleanup

Operator cleanup
Merge branch 'master' into PIM-2602_abstract_models