Pywaffle

* Make either one of `rows` and `columsn` optional
* Remove deprecated parameter `plot_direction`
* Add online demo

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* Add parameter `characters`, `font_file` and `font_size` for plotting with characters.
* Add parameter `tight`
* Add more tests

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* Rename parameter `block_aspect` to `block_aspect_ratio`
* Deprecate `icon_set`, use `icon_style` instead. `icon_style` accepts font style for each icon
* Deprecate `plot_direction`, use `starting_location` instead
* Finished documents with more examples. See [https://pywaffle.readthedocs.io/](https://pywaffle.readthedocs.io/)

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* Update Font Awesome to 5.5.0

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* First public version