anchor.diff:    * added new XML-based callouts to AsciiDoc compatibility file
     * added absolute and uri image target matching to AsciiDoc compatibility file
     * removed linkcss in AsciiDoc compatibility file
  +  * fixed fenced code entry in compatibility file
   
   Bug Fixes::
   
     * lowercase attribute names passed to API (#508)
     * numbered can still be toggled even when enabled in API (#393)
     * allow JRuby Map as attributes (#396)
  -  * handle callout marks properly when using CodeRay (#534)
  +  * don't attempt to highlight callouts when using CodeRay and Pygments (#534)
     * correctly calculate line length in Ruby 1.8 (#167)
     * write to specified outfile even when input is stdin (#500)
     * only split quote attribution on first comma in Markdown blockquotes (#389)
     * don't attempt to print render times when doc is not rendered
  +  * don't recognize line with four backticks as a fenced code block (#611)
   
   Improvements::
   
     * upgraded Font Awesome to 3.2.1 (#451)
     * improved the built-in CodeRay theme to match Asciidoctor styles
     * link to CodeRay stylesheet if linkcss is set (#381)
  +  * style the video block (title & margin) (#590)
  +  * added Groovy, Clojure, Python and YAML to floating language hint 
  +  * only process callouts for blocks in which callouts are found
     * added content_model to AbstractBlock, rename buffer to lines
     * use Untitled as document title in rendered output if document has no title
     * rename include-depth attribute to max-include-depth, set 64 as default value (#591)
  
positive.code:   * added support for checklists in unordered list (#200)
    * added DocBook 5 backend (#411)
    * added docinfo option for footer (#486)
    * added pygments as source highlighter option (#538)
    * added icon inline macro (#529)
    * recognize implicit table header row (#387)
    * uri can be used in inline image (#470)
  
negative.code:   * removed dependency on pending library, lock Nokogiri version to 1.5.10
    * removed require rubygems line in asciidoctor.rb, add to cli if RUBY_VERSION < 1.9
    * added tests for custom backends
    * added test that shorthand doesn't clobber explicit options (#481)
    * removed unnecessary monospace class from literal and listing blocks
  
  Distribution Packages::
  
  