message: elle.json: don't print with a trailing eol
  This shows in particular in the logs when the JSON is displayed in
  quotes.
diff: @@ -184,14 +184,14 @@ namespace elle
  std::ostream&
  operator <<(std::ostream& stream, Object const& obj)
  {
  - write(stream, obj);
  + write(stream, obj, false);
  return stream;
  }
  std::ostream&
  operator <<(std::ostream& stream, OrderedObject const& obj)
  {
  - write(stream, obj);
  + write(stream, obj, false);
  return stream;
  }
  }
  