anchor.diff:  The authors in each chapter document are aggregated together with the authors in the master file.
   
   |username
  -|Used to resolve an avatar for the author that is displayed in the header of a chapter.
  +|Used to resolve the avatar for the author that is displayed in the header of a chapter when the `publication-type` is set to a value other than `book`.
   The avatar image should be located at the path _\{imagesdir}/avatars/\{username}.jpg_, where `\{username}` is the value of this attribute.
   
   |producer
  
positive.code: 
  == Working with Images
  
  Images that your AsciiDoc document references should be saved in the directory defined in the `imagesdir` attribute, which defaults to the directory of the document.
  {project-name} will discover all local image references and insert the images into the EPUB3 archive at the same relative path.
  
  WARNING: Currently including images only works correctly if you set `imagesdir` to the directory `images` like in the example shown above.
  This will be fixed in future versions.
  
  The sample book contains placeholder images for an author avatar and a book cover.
  
  
negative.code: 
  Ereaders have different image resolution and file size limits regarding a book's cover.
  Kindle covers tend to be 1050x1600 (16:9 resolution), which is the size of the sample cover provided with {project-name}.
  To ensure your cover displays correctly, you'll want to review the documentation or publisher guidelines for the reading platform you're targeting.
  
  WARNING: We've found that if the book cover is more than 1600px on any side, Aldiko will not render it and may even crash.
  
  