- Corrected the information of the instruction of making a submit button float right.
- Updated the example of making a submit button float right in meta boxes.
- Added a style for debug output container elements.
Cleaned a debug line.
- Changed the format of ID of section container elements.
- Advanced the version number to help identify the changes.
- Generated the minified version to reflect the changes.
- Fixed a bug that in page meta boxes, the `select` field type with the `is_multiple` argument enabled could not store the submitted data properly.
- Fixed a bug that page meta boxes could not be added by in-page tab slug.
- Advanced the version number to help identify the changes.
- Generated the minified version to reflect the changes.
- Tweaked attributes of multiple section select field.
- Changed the validation callback method names to 'validate()' from `validation_{class name}`.