Confu

Added
- Python 3.7 support (29)
- `Directory Attribute`: `require_exist` argument (28)
- `File Attribute`: `require_exist` argument (25)
Changed
- PyPI package renamed to `confu`
- `Directory Attribute`: expand user and make path absolute during validation (27)
- `File Attribute`: expand user and make path absolute during validation (26)

Fixed
- added missing docs files

Added
- `argparse_options`: `attributes` keyword argument added (24)
- `click_options`: `attributes` keyword argument added (24)
Changed
- use pymdgen for automatic api docs (22)

Added
- `Attribute`: `cli` argument can now be a function (21)
Fixed
- fix 23: better error handling in apply_defaults

Added
- `defaults` parameter for argparse_options and click_options (20)
Fixed
- `List` still requires name attribute on init (17)

Fixed
- Fixed issue where `List` holding `Schema` type items would lose items to validation warnings (18)