deleted:    lib/about-thumb.jpg
	new file:   lib/about-thumb.png
	deleted:    lib/hacking-thumb.jpg
	new file:   lib/hacking-thumb.png
	deleted:    lib/index-thumb.jpg
	new file:   lib/index-thumb.png
	deleted:    lib/research-thumb.jpg
	new file:   lib/research-thumb.png