Added tips.
- Changed the timing of loading field type definitions in the taxonomy and meta box classes to allow define custom field types in the `setUp()` method.
Moved the code blocks of defining custom field types to be loaded after the page evaluation is done.
Modified a comment.
Made it use include() instead of include_once().
- Advanced the version number.
- Applied the changes to the minified version.
Fixed a bug that page meta boxes could not be loaded due to the recent commits regarding changing the timing of registering field types.
Applied the changes to the minified version.