Purdue’s freshmen grew up just in time to deny Rick Pitino his 500th college coaching win. Robbie Hummel, one of the Boilermakers’ four freshman starters, scored 15 points, and the Boilermakers beat No. 22 Louisville 67-59 on Saturday in the Wooden Tradition. Purdue had lost at Clemson and Missouri, but this time handled a late challenge at Conseco Fieldhouse to get their first victory over a…