def apply(cell)
      return false unless cell
      filter_items.each do |filter|
        return false if cell.value == filter.val
      end
      true
    end
def apply(cell)
      return false unless cell
      filter_items.each do |filter|
        return false if cell.value == filter.val
      end
      true
    end
Tells us if the row of the cell provided should be filterd as it
 does not meet any of the specified filter_items or
 date_group_items restrictions.
 @param [Cell] cell The cell to test against items
 TODO implement this for date filters as well!