def initialize(title="", title_size="")
      self.cell = title if title.is_a?(Cell)
      self.text = title.to_s unless title.is_a?(Cell)
      if title_size.to_s.empty?
        self.text_size = "1600"
      else
        self.text_size = title_size.to_s
      end
    end
Creates a new Title object
@param [String, Cell] title The cell or string to be used for the chart's title