Yorm

- Container types now extend their builtin type.
- Added `None<Type>` extended types with `None` as a default.
- Added `AttributeDictionary` with keys available as attributes.
- Added `SortedList` that sorts when dumped.

- Allowing `map_attr` and `store` to be used together.
- Allowing `Dictionary` containers to be used as attributes.
- Fixed method resolution order for modified classes.
- Added a `yorm.settings.fake` option to bypass the filesystem.

- Fixed typos in examples.

- Initial release.