class Prawn::Table

values that will be used to ink the table.
subsequent calls to column_widths and width should return the finalized
cell in a column is the same width. After this method is called,
Assigns the calculated column widths to each cell. This ensures that each

def set_column_widths
  column_widths.each_with_index do |w, col_num|
    column(col_num).width = w
  end
end