TOC Tweaking

- The TOC is pulled out of the normal flow of the HTML so it sits on top of the chapter text. 
- Modified toc's css so that it shows all sections 
- Brought in [Font Awesome](http://fortawesome.github.io/Font-Awesome/) 4.2.0 for icons
- Using jquery, toc can be animated to be opened/closed by moving it on-/off-screen 
- Changes in `static/style/style.css` were made at the top of the file, but should be reintegrated into proper locations later