version 0.5

• Added Wikicode.contains() to determine whether a Node or Wikicode object is
  contained within another Wikicode object.
• Added Wikicode.get_ancestors() and Wikicode.get_parent() to find all
  ancestors and the direct parent of a Node, respectively.
• Fixed a long-standing performance issue with deeply nested, invalid syntax
  (issue #42). The parser should be much faster on certain complex pages. The
  "max cycle" restriction has also been removed, so some situations where
  templates at the end of a page were being skipped are now resolved.
• Made Template.remove(keep_field=True) behave more reasonably when the
  parameter is already empty.
• Added the keep_template_params argument to Wikicode.strip_code(). If True,
  then template parameters will be preserved in the output.
• Wikicode objects can now be pickled properly (fixed infinite recursion error
  on incompletely-constructed StringMixIn subclasses).
• Fixed Wikicode.matches()'s behavior on iterables besides lists and tuples.
• Fixed len() sometimes raising ValueError on empty node lists.
• Fixed a rare parsing bug involving self-closing tags inside the attributes of
  unpaired tags.
• Fixed release script after changes to PyPI.