Rebound in oil prices pushes shares higher

By Sam Forgione NEW YORK (Reuters) - Stock markets worldwide rose modestly on Tuesday after a landmark nuclear deal between Tehran and six global powers left sanctions on Iran in place for now, spurring gains in energy shares, while expectations for weak corporate results capped U.S. share gains. Brent and U.S. crude reversed losses which came after the nuclear deal was reached. The deal, which is set to ease sanctions against Tehran and allow a gradual rise in its oil exports, had sent oil pric