Update V1.2

Hey all,

I've made a few minor updates to the Circle of Ruin PDF. First and most noticable, it now has a proper cover! Secondly to credit the artist and make room for update text, the changelog and legal things have all been moved to a new page, and a new public domain artpiece has been added to the page featuring Kibbles' Spells. Finally, a small change on paper, but big change in play: The druation of Stone Form has been reduced to 10 minutes for balance reasons.