PIM-1674: Remove "useless" methods working with completeness in Product entity
PIM-1674: Change definition of completeness and product
PIM-1674: Change completeness manager to play with product id instead of product
PIM-1674 Linked with completeness removed
Fixes wrong message when product has no family
Merge branch 'master' into PIM-1674
PIM-1674 Declare changelog
PIM-1674 Light refactor to get different Completeness generator
PIM-1674 Fixes CS
Remove last relation between Completeness and Products
Still some references to completeness in ProductTest
Fixes some remark from @fitn and @filipsalpe, and remove obselete missingAttributes
Remove useless dot at the end of phrase
Merge branch 'master' into PIM-1674

Conflicts:
	CHANGELOG.md
Merge pull request #575 from akeneo/PIM-1674

Pim 1674 - Remove Completeness relationship