- Switch from tinynav.js to selectnav.js to get rid of jQuery dependence.
- Style selectnav menu
	modified:   content/about.html
	modified:   content/media/css/base.css
	modified:   content/media/css/medium.css
	modified:   content/media/css/small.css
	new file:   content/media/js/libs/selectnav.min.js
	deleted:    content/media/js/libs/tinynav.min.js
	modified:   layout/base.j2
	modified:   layout/header.j2