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
Merge branch 'master' into PIM-2074
Update changelog
Merge pull request #830 from akeneo/PIM-2074

PIM-2074 Simplify the creation of custom attribute properties