Revert "Merge pull request #689 from akeneo/feature/add_families_to_attributes"

This reverts commit 082d4c5d9b8c204129bfb38adeaf87a7cb90f61a, reversing
changes made to a8122d39233e257c9e60c9e302c1f61eda016789.
Merge pull request #690 from akeneo/revert_pull_request

Revert "Merge pull request #689 from akeneo/feature/add_families_to_attr...