Tama the railway cat has boosted her employer's revenues by 10 percent. Care to come to San Francisco on your vacation, kitty?By now, many of you will have read the made-for-the-Web story of Tama, the calico savior of Kishikawa station. When the owners of the Japanese Wakayama Railway got wind of the adorable, social cat hanging out at the station greeting passengers, they reacted the way basketball scouts did when they saw LeBron James dunking in junior high school. The rail line designated