Log Message:
py-markdown2: updated to 2.4.11

python-markdown2 2.4.11

- Fix angles being escaped in style blocks
- Fix base64 images being corrupted in safe mode
- Add `breaks` extra with ability to hard break on backslashes
- Fix 493 persisting when `code-friendly` extra enabled
- Update `_slugify` to use utf-8 encoding
- Maintain order of appearance in footnotes
- Include HTML headers in TOC
- Add mechanism to prevent header ID counter resetting