def push(row)
      row = Workbook::Row.new(row) if row.class == Array
      super(row)
      row.set_table(self)
    end
def push(row)
      row = Workbook::Row.new(row) if row.class == Array
      super(row)
      row.set_table(self)
    end
Add row
 @param [Workbook::Table, Array] row to add