Log Message:
Update py-markdown2 to 2.2.1.

## python-markdown2 2.2.1

- [issue #142 pull #141] Fix parentheses and spaces in urls.
- [issue #88 issue #95 pull #145] Fix code blocks in code blocks with syntax \ 
highlighting.
- [issue #113 issue #127 via pull #144] Fix fenced-code-blocks html and code output.
- [pull #133] Unify the -/= and ## style headers and fix TOC order
- [pull #146] tag-friendly extra to require that atx headers have a space after #