Culver Pictures In an 1862 lithograph, a slave is depicted fleeing toward Canada before the Civil War.VANCOUVER, British Columbia — Heaven was the word for Canada and the Negro sang of the hope that his escape on the Underground Railroad would carry him there," the Rev. Dr. Martin Luther King Jr. once noted in describing the codes American slaves used in their spirituals to fool their masters before taking flight. Canada is heaven again for Lance W. Bateman and William E. Woods, two American men who were married here recently. The wedding on Aug. 31 looked like a typical Hawaiian...