Modularize components and add Links menu for mobile

- Various components - disqus, analytics modularized better.
- List of links moved into it's own file.
- Links menu for mobile, hidden on larger screen, since the sidebar
is hidden on mobile.
- Add comments to config
Reset source tree starting at jekyll-clean

Rebasing on the original tree with octopress history was getting
too painful. Old history available in old-master.