Add Disqus comments on every page with sidebar (hopefully for lessons and problems)
It's better to add Disqus to the _lesson_page.html. Sidebar in the future will probably also be on the other pages... Including those in which it is not needed.
Merge pull request #27 from pythontutor/add_disqus_comments

Add Disqus comments on every page with sidebar (hopefully for lessons an...