Krell, David.  Forward by Branch Rickey III. Our Bums: The Brooklyn Dodgers in History, Memory, and Popular Culture.  Jefferson, NC: McFarland, 2015.   Pp. 240.  Notes, References, Index.  $29.95 softcover.  Reviewed by Rich Loosbrock Baseball and nostalgia go hand in hand.  Mentions of baseball in popular culture, be it movies, documentaries, biographies, or memoirs, are bathed…