BusinessHours#after should respect work_hours
BusinessHours#after should respect work_hours

BusinessHours#after was using the private method off_hours to jump ahead
to to the next days beginning_of_day, but that method did not check for
day-specific work hours.

damiantq/business_time,codebender/its_business_time,bokmann/business_time,bokmann/business_time,kantox/business_time