Disney's "Beauty and the Beast" was first released in 1991, but it's still as fresh and appealing today as it was 21 years ago, which a new generation of moviegoers will find out with the film's 3-D re-release this week. What's responsible for the studio's lasting success? In part, it's the marketing. Disney movies have an unmistakable look and charm that gives us the warm and fuzzies. (You kn…