don't display title and author in the web page
clarify why text-rendering goes with a body selector
move Alegreya bits to ebook.css
ignore intermediate .zip files
orthodoxize.py: generalize to multiple works
add iTunes and date metadata

- orthodoxize.py: add iTunesMetadata.plist to the generated ePub
- literature.css, webpage.css: update CSS to do something sensible with the date in the title page
- dublin-core-metadata.xml, call-of-cthulhu.markdown: this was made in 1926
remove unused ebook.css