By Evin Demirel In 29 years as NBA commissioner, David Stern has led his league to unprecedented heights by opening its doors to nearly every corner of the world. He expects its next generation of stars, some of whom just finished playing on their franchises’ summer teams, to continue fueling growth through diversity and global expansion. A quick scan at the statistical leaders for the NBA Summer League, which wrapped Monday in Las Vegas, seems to indicate everything is on track. There are