(1) Update to 1.4.0 release
(2) Migrate book to stable version 1.2
(3) Add images to HTML book
(4) Add dependency to gfind (findutils) for asvn
(5) Improve asvn script
PR: ports/99177 [4],[5]
Submitted by: David Robillard <david.robillard@gmail.com> [3]