...including the headings!
On: http://symfony2admingenerator.org/roadmap.html
Everything is struck-through, indicating completed. I'm assuming that the reverse is true and nothing is completed? ;-)

I would fix it, but I can't see what you intended where the error is:
* Implement nested set for <strike>propel and</strike> doctrine<strike>
https://raw.githubusercontent.com/symfony2admingenerator/symfony2admingenerator.github.com/master/roadmap.markdown