• Trial to handle transliterated or unicode labels, for GitHub #16
  
• add transliterate_ids and unicode_ids options
  
• add to_html method, which is the same as markdown but should be
  used for anything new. Eventually markdown will be deprecated because
  it's the wrong name.
  
• add the multimarkdown_to_html function for the same reason. Use
  that instead of markdown() if you can.
  
• Text::Unidecode is now a prereq, for transliterate_ids