GLOBAL MARKETS-US dollar, stocks dip as Fed keeps taper timing close to chest
* Dow falls 0.4%, S&P flat, Nasdaq rebounds 0.7%
* European stocks boosted by upbeat earnings
* China blue-chip index closes up 0.2%
* Yuan edges back from three-month lows
* Dollar softens
By Koh Gui Qing
NEW YORK, July 28 (Reuters) -…
