fix to include links in leaders

but not org-mode table of contents. okay so it is a hack, but it
works.

additionally, I've accidentally squashed in a fix to include add
xml:base per post in the feed. oh well.

strip leading and trailing whitespace from leader

add XML domain base, maybe for relative URLs

fix self-link element in atom feed

bug fix for link_path and escaping

remove markdown library

includes hack-y parsing of HTML for title, leader, date appears to
work but could be better

update setup.py

it looks like PyPI already has 0.2 (which I don't recall)

update README

add integration test

sort of horrible, I'm not sure if these are actually good
changes. Partly necessary due to the addition of threadpooling, but
the feedback is poor and they're obviously fragile.

swap FreeBSD build for OpenBSD

remove pip upgrade

remove list comprehension

needlessly ugly

update copyright notice

bump python version for freebsd build

3.6 does not include dataclasses

bump build target versions

add threadpools for I/O intensive sections

include some refactoring to simplify parsing, uses a few features that
might be python 3.7 only

Binary mode doesn't take an encoding!

Specify default encoding

Without an encoding specified for the open() method, it relies on the
default system encoding

Convert README, add CI config

  pandoc -f rst -t markdown -o README.md

Remove f-string formatting, the bleeding-edge sucks

F-string formatting isn't worth the headaches associated with getting
a CI system configured correctly with a non-package build of python
3.6. I'd rather _not_ be tied to testing on a linux distro I don't
deploy to.

Fix up documentation

 - briefly explain template syntax
 - provide defaults in generated config.ini to prevent errors if
   unconfigured
 - update email in setup.py