Styled chapter list and video scrubber.
Merge branch 'master' of github.com:storytellinginnovationlab2013/hazardoushospitals

* 'master' of github.com:storytellinginnovationlab2013/hazardoushospitals:
  fix playpause
  fix titles
  refactor timeline, bacteria

Conflicts:
	css/screen.css
	js/script.js
	sass/screen.sass