removed CIImage from building diff overlay, after quartz-dev hing that IKImageView may not play nicely with CIImages
removed CIImage from building diff overlay, after quartz-dev hing that IKImageView may not play nicely with CIImages

--HG--
branch : barrywark

escoz/core-plot,escoz/core-plot,escoz/core-plot,escoz/core-plot,escoz/core-plot