Bring back support for un-commented frontmatter.

[icco]

My frontmatter follows the jekyll spec, and looks like https://raw.githubusercontent.com/icco/blog-backup/83b109a828564db39b995b59ca852ff9e61d0412/_posts/2017-03-16-644.md. With 0.1.0 you seem to have dropped support of this frontmatter style.

[waiting-for-dev]

Hi @icco , you can still parse that kind of front matters with the :md syntax. Is it clear how?

[icco]

Perfect, thanks!