Klasky Csupo, the studio responsible for a great deal of animation on television these days, has found a way to release some of the tension that must have built up over rumors of its recent financial struggles. Global Tantrum.com, the studio’s new site, is naughty, rude and full of very adult-natured content. The animation is low-tech and the humor lowbrow, but there are some funny things to be found for mature and broad-minded audiences.