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**Features and Improvements**
- add the ``afwf.opt`` modules. It stores lots of optional utility tools
- add the :mod:`afwf.opt.cache` module.
- add the :mod:`afwf.opt.fuzzy` module.
- add the :mod:`afwf.opt.fuzzy_item` module.
**Minor Improvements**
- now all of :meth:`afwf.item.Item.open_file`, :meth:`afwf.item.Item.open_url`, ..., method returns the :class:`afwf.item.Item` object itself, so you can chain them together.