For those who choose a staycation around the subject of contemporary Atlanta history, there is no better place to start than Tom Houck’s civil rights bus tour. The 76-year-old Houck is one of the relatively small handful of living civil rights workers who had personal, day-to-day contact with Dr. Martin Luther King, Jr. during the height of the civil rights struggles of the mid-1960s. The Boston native is part of an even smaller group of white civil rights veterans who worked directly with King during the period.