books.html: adding missing html tags
books: change styling and html structure
books: add missing class declarations
books: update info on a couple books
books: add English books from http://caml.inria.fr/about/books.en.html
books: port non-English books from http://caml.inria.fr/about/books.en.html
books: add title for English books
books: move Camlp4 Reference Manual further down