Video length indicator

Conflicts:
	common.js
	imager/index.js
Highlight parent backlink

Closes bakape#95

Conflicts:
	client/hover.js
Restyle + refactor Reverse backlink highlight

Addresses bakape#95

Conflicts:
	www/css/ashita.css
	www/css/gar.css
	www/css/glass.css
	www/css/higan.css
	www/css/mawaru.css
	www/css/moe.css
	www/css/moon.css
	www/css/rave.css
	www/css/tavern.css
	www/css/tea.css