Added Zip File

Added a zip file for much easier downloads, which I really should have been done a while back as a fill-in for the compiled book.

As for the book, I've hit issues with it every time I've tried to get it sorted. It's still something I would like to do at some point, but there were a lot of decisions made during the development of each of these that have made it more difficult to compile now. Or, more rather, I don't quite have the knowledge yet as how to fix these issues.

It's still in the works, but I don't know when it will be finished.