Add an array properties field to Attribute entity for storing custom properties
Simplify attribute custom property definition
Remove magic getters and setters for attribute properties and use get/setProperty instead
Fix an issue with checkbox state in attribute form
Update changelog
Merge branch '1.0' into PIM-2074
Merge branch '1.0' into PIM-2074
PIM-2164 Remove the deprecated fallback property of locale
PIM-2166: Fix remove option issue
PIM-2166: Update CHANGELOG.md
Merge branch 'master' into fix/PIM-2166

Conflicts:
	CHANGELOG.md
PIM-2166: Update changelog
PIM-2166: Create scenario for fix
PIM-2166: Add more comments
PIM-2166: Clean features
Merge pull request #825 from akeneo/fix/PIM-2166

PIM-2166: No way to delete an attribute option
Fix PHPCS
Fix PHPCS
PIM-1913: Fix issue allowing to don't set required field
PIM-1913: Update fixtures