wkb:

Clarified some docstrings.
wkb:

Removed some code duplication in the WKB dumping functions.
wkb:

Implemented `__dump_polygon`.
tests/wkb_test:

Added a 2D test case for `__dump_polygon`.
wkb:

Implemented `__dump_polygon`.
Added empty wkb_detail.md
Update wkb_detail.md

Added fully detailed content for WKB formats.
wkb:

Fixed a python3 compatibility issue in wkb's __dump_polygon method.
Added tox and test artifacts files to .gitignore