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
Fix typo in spec method name
Use the 'shouldImplement' phpspec matcher to check for implementation of interfaces
Clean up EntityToIdentifierTransformerSpec
Merge branch 'master' into PIM-2602_abstract_models
PIM-2602 : update MongoDB normalizers to be able to deal with abstract
classes
Fix attribute type number configuration
Merge pull request #1103 from akeneo/fix/attributetypenumber

Fix attribute type number configuration
Merge branch 'master' into PIM-2602_abstract_models
Replace some "==" by "==="
Replace "!=" by "!==" operator
Fix typo in phpdoc