Automate build process

This is a series of changes designed to make this book build from a Makefile and with few dependency headaches.

 * Added makefile to build from commandline
 * Switched to freely licensed fonts (the original fonts are proprietary and only available on some systems)
 * Included the fonts for easy installation by user
 * Added (require 'cl) to elisp for the 'find' function
 * Noted some dependencies in the documentation