Added a method that applies the 'field_definition_{...}' filters.
Added the 'field_definition_{...}' filters.
Added a change log item.
Changed the version to 3.0.2b.
Fixed a bug that assigning a value to the wrong array element.
Fixed a typo.
Added the `label` default key.
Added examples of using 'field_definition_{...}' callbacks to the demo plugin.
Applied the changes to the minified version.
Updated the documentation.