Added the figure and figcaption styles and the img.thumbnail one, and ditched p.credits.
Added the figure and figcaption styles and the img.thumbnail one, and ditched p.credits.

holman/usesthis,orta/usesthis,ivuk/usesthis,MjAbuz/usesthis,MjAbuz/usesthis,waferbaby/usesthis,holman/usesthis,MjAbuz/usesthis,orta/usesthis,ivuk/usesthis,waferbaby/usesthis