Thousands of Puerto Ricans gathered Wednesday in the commonwealth capital of San Juan to demand the resignation of Gov. Ricardo Rosselló, the second mass demonstration against the embattled leader this week. Waving Puerto Rican flags -- some in black and gray to signal their discontent with the government -- and chanting demands that Rosselló step down, demonstrators of every age group said they were fed up with the corruption of elected officials as well as crippling austerity measures that have scaled back necessary services in recent years. The crowd included pop star Ricky Martin and reggaeton artists Benito Martinez Ocasio...