anchor.diff:  .Packager
   * CRITICAL: use "uid" attribute in favor of document id if available
   * HIGH: add NOTICE.adoc to e-book archive
  +* HIGH: rework GEPUB so closures work more like in Prawn...perhaps using a wrapper
   * HIGH: minimize CSS (and any other assets worth minimizing)
   * MEDIUM: set modified date explicitly
   * MEDIUM: use function to build and manipulate image paths
  
positive.code: //^
  
  .Converter
  * CRITICAL: put e-book reader class on html instead of body
  * CRITICAL: dropping subsequent paragraphs of preamble when abstract is found...need to pass them through
  * CRITICAL: try to pull username from author email field; pull image from gravatar
  
negative.code: * Kindle won't accept fonts that are less than 1K (typically can't create a font with just one or two characters)
  * Control+Shift+u to type in a unicode sequent, then press enter to accept
  * Calibre gets confused when there are local fonts that closely match font in stylesheet, uses them over embedded styles (in particular M+ weights)
  * iBooks info: http://authoradventures.blogspot.com/2013/08/ibooks-tutorial-update-version-30.html
  