Flatdict2

- ADDED Support lists and tuples as well as dicts. (4 - [alex-hutton](https://github.com/alex-hutton))

- ADDED Python wheel support

- Documentation and CI updates
- CHANGED use of `dict()` to a dict literal `{}`

- ADDED `FlatDict.as_dict()`
- ADDED Python 3 support
- ADDED `FlatDict.set_delimiter()`
- Bugfixes and improvements from [naiquevin](https://github.com/naiquevin)

- Initial release