anchor.diff:  
   == TODO
   
  +* upgrade Treetop
   * rename example to basic-example and chronicles to chronicles-example
   * recognize inline image syntax in page_background_image key
   * allow front cover and back cover image to be defined in theme; document in theming-guide
  
positive.code: 
  * uncompress PNG files
  * avoid the fallback font if possible (use full fonts in your theme)
  
  == Open Questions
  
  
negative.code: * create proper default (Asciidoctor) theme
  * list bullet in ordered list needs to grow with length of number
  * document how the treetop parser is rebuilt
  * use ImageMagick to uncompress PNG images before reading them (could also just document this)
  * rework font so we can set actual height, calculate x_height internally (use 1em for spacings)
  * padding top and bottom on content affects height_of calculations (need to review)
  