Lending platform GreenSky Inc GSKY.O surged after Goldman Sachs Group Inc GS.N said it would buy the company in an all-stock deal valued at $2.24 billion. By Stephen Culp NEW YORK, Sept 15 (Reuters) - U.S. stocks ended higher on Wednesday as surging crude prices boosted energy shares and a swath of positive U.S. data suggested inflation has crested and the economic recovery remains robust, prompting a broad rally. Next week, the Federal Open Markets Committee's two-day monetary policy meeting will be closely parsed for signals as to when the central bank will begin to taper its asset purchases.