Log Message:
Update to Pigeonhole 0.2.5:

+ Sieve vacation extension: made discard message for implicit
  delivery more verbose
- The sieve-test tool: mixed up original and final envelope recipient
  in implementation of command line arguments.
- Sieve vacation extension: resolved FIXME regarding the use of
  variables in the :handle argument. Variables are now handled
  correctly.
- Sieve body extension: fixed handling of :content "message/rfc822".
  This now yields the headers of the embedded message as required by
  the specification. Handling of :content "multipart" remains to be
  fixed.
- LDA Sieve plugin: fixed problem with recipient_delimiter
  configuration. Now it falls back to global recipient_delimiter
  setting if plugin/recipient_delimiter is not set.