Sketching the new TOC view.
Bring back the TOC. Not functional yet.
Added click handler.
Make figure/citation references interactive again.
Support level 4 headings.
Modularized Undescore.
Styles for Level 5 headers
Generated package.json.
Merge branch '0.1.x' of https://github.com/substance/toc into 0.1.x
Don't render the TOC for <= 2 headings
Cleanup.