Adding contributors and replacing attempts at embedding gist and vimeo screencast with regular text.
Adding contributors and replacing attempts at embedding gist and vimeo screencast with regular text.

chunseoklee/overtone,mcanthony/overtone,brunchboy/overtone,pje/overtone,rosejn/overtone,craftybones/overtone,ethancrawford/overtone,Widea/overtone,la3lma/overtone