The rout continues.Major Asian stock markets fell Friday as investors continued to dump riskier assets. Japan’s Nikkei tumbled 5.3% to its lowest level in more than 15 months. The Hang Seng in Hong Kong dropped 1% after plunging 3.9% the day before.The falls in Asia follow losses in U.S. and European markets on Thursday amid worries over low oil prices and the health of the banking sector.The Japanese stock market ...