1st edition book code

Creating an initial release. This code isn't quite the original from when the book was originally released, but it's close.

However, new changes to wxPython and ObjectlistView may have broken some examples, so it's time to do a code audit and make a new release.

This initial release is for posterity and for those who still own the first edition of the book

What's Changed

• add requirement for pypubsub, and small blurb abount pip3 by @slogan621 in #29

New Contributors

• @slogan621 made their first contribution in #29

Full Changelog: https://github.com/driscollis/applications_with_wxpython/commits/x1.0.0