libearth 0.1.2

• XML elements in data files are written in canonical order. For example,
  <title> element of the feed was at the back before, but now is in front.
• Fixed a bug that libearth.parser.autodiscovery raises
  AttributeError when the given HTML contains <link> to
  both application/atom+xml and application/rss+xml.
  [#40]
• Fill <title> to <description> if there's no <title>
  (libearth.parser.rss2).
• Fill <id> to the feed URL if there's no <id>
  (libearth.parser.atom).