def stats_list(list = nil, date = nil)
      data = {}
      if list != nil
        data[:list] = list
      end
      if date != nil
        data[:date] = date
      end
      data[:stat] = 'list'
      api_get(:stats, data)
    end
def stats_list(list = nil, date = nil)
      data = {}
      if list != nil
        data[:list] = list
      end
      if date != nil
        data[:date] = date
      end
      data[:stat] = 'list'
      api_get(:stats, data)
    end
params
   list, String
   date, String

 returns:
   hash, response from server
 Retrieve information about your subscriber counts on a particular list, on a particular day.