Centenary University bestowed the world’s first post-graduate degrees in “happiness studies” on 87 students from 13 countries earlier this month. But, for most of the graduates, their study of the topic isn’t over. Technically, the pursuit of happiness is a process without an endpoint, they say. And some say they can’t wait to return to college to get a doctorate in happiness — because the New Jersey university’s master’s degree has left them hungry to spend more years learning about bliss. “It’s a way for us to deal with one of the biggest issues in the world, through rigorous academics,” sai…