Hurricane Ivan Churns Toward Caribbean BRIDGETOWN, Barbados - Hurricane Ivan churned toward the Caribbean on Monday, packing sustained winds of 115 mph and threatening to hit Barbados and other islands, after it strengthened from tropical storm status with unusual speed.    Residents rushed to install storm shutters and schools remained closed in Barbados, where the Category 3 storm - the fourth major hurricane of the season - was expected to hit late Tuesday...