* Syntax highlighting: applied to 18 out of 187 code listings.
* I added CSS to format the early release contributor names as a two-column list. Let me know if we need to do something for the EPUB too.
* I added pdf CSS to format the early release contributor names as a twocolumn list. Let me know if we need to do something for the EPUB too.
* There are a number of files in the repository that aren't in the build list. I didn't remove any since it's not always obvious whether they are needed or not (e.g. pulled in via include statements vs. just leftover from the previous edition and no longer used.)