GLOBAL MARKETS-Oil falls, stocks mostly rebound as Fed meets

* Stocks rebound as investors snap up beaten-down shares* Ruble falls again after rate hike to 17 percent* Moscow stocks plunge, crude trades below $60 a barrel(Adds close of U.S. markets)By Herbert LashNEW YORK, Dec 16 (Reuters) - Oil prices pared losses and global equity markets partially rebounded on Tuesday in roller-coaster trading as investors snapped up beaten-down energy stocks and wagered