Wasabi

* Add symbols to `diff_strings`.

- Allow foreground and background colors to be specified for individual table columns.
- Allow color values as well as color names as the `color` parameter to `Printer.text()`.
- Add a new `bg_color`parameter to `Printer.text()`.
- Correct a couple of minor documentation errors.
- Add version to `__init__.py`.

* Add `aligns` support for table headers.

* Correctly respect `show` on `Printer.divider`.
* Fix automated build.

* Add `MarkdownRenderer` for creating Markdown-formatted documents.
* Update `diff_strings` so it diffs lines and produces more usable results.

* Fix `diff_strings` for replacements.