Log Message:
lowdown: update to 0.6.1.

ChangeLog:

lowdown 0.6.1:

- Quick fix: we never actually... printed for the diff.

lowdown 0.6.0:

- Pull in newest oconfigure.
- Add common usage.
- Emit surrounding <p> for a list item if it's in a block and not already
  containing block element(s).
- Bring docs up to date with code.
- Allow blank-separated definition key/value pairs to trigger block mode.
- Record whether a paragraph ends with a blank line or not.
- Proper styling of line prefixes.
- Get proper spacing for definition lists with -Tterm.
- Paragraphs in definition values don't get two newlines.
- Don't needlessly break up paragraphs that have a dli prefix in them when
  within a list context.
- Show in alpha order.
- Document definition lists.
- Make line breaking around definition lists consistent.
- Merge multiple definition lists.
- Report definition list status.
- Complete parsing support for single-title description lists.  There's
  still work to be done, but this covers most uses.
- Recognise two newlines before a dli prefix as starting a block dli.
- Parse multiple definition list titles, don't parse zero-length trailing
  definition list data,  and properly form nroff definition lists w/multiple
  datas.
- Add definition lists to -Tterm, documentation to nroff, forgotten header
  change.
- Add nroff support for definition lists and clean up regular lists, too.
- Parse definition lists by default and add disabling documentation for them.
- Support for definition lists.
- const-ify and make sure formatters don't puke on definition lists.
- Add initial support for PHP Markdown Extra (and the many others inheriting
  this functionality) definition lists.  So far very simple and not enabled
  by default.