Refactor form state storage
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-1642

Conflicts:
	src/Pim/Bundle/UIBundle/Resources/public/js/pim-init.js
	src/Pim/Bundle/UIBundle/Resources/views/require.js.config.html.twig
Added ProductAttributeInterface
Corrected flexible entity config
Corrected validation
Merge branch 'master' into PIM-1674

Conflicts:
	CHANGELOG.md
Corrected bugs in form types