Update to 0.41

Upstream changes:
version: 0.41
date:    Wed Mar 13 10:34:55 PDT 2013
changes:
- Removed another C++ // style comment. jdb++
---
version: 0.40
date:    Tue Mar 12 11:05:34 PDT 2013
changes:
- Removed C++ // style comments, for better portability. jdb++
---
version: 0.39
date:    Mon Feb 11 18:08:04 PST 2013
changes:
- Using the latest libyaml codebase
- https://github.com/yaml/libyaml/tree/perl-yaml-xs
- Changes have been made to start moving libyaml to 1.2

(wen)