3.1.1
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* Improvements to the JS/CSS for videos and TTML
* Changed gettext infrastructure, use itstool
* Improvements and cleanup to DocBook code
* Implemented experimental Mallard conditional processing
* Updated to jQuery.syntax 3.0, custom layout file
* Don't embed div in a tag for linkdivs
* Added title attribute to HTML output for all links
* Updated translations:
  en_GB (Bruce Cowan)
  es    (Jorge González)
  id    (Andika Triwidada)
  sr    (Мирослав Николић)
  sv    (Daniel Nylander)
  vi    (Nguyễn Thái Ngọc Duy)