def open_rejects(file)
      # Make the parent directory.
      FileUtils.mkdir_p(File.dirname(file))
      # Open the file.
      FasterCSV.open(file, 'w', :headers => true, :header_converters => :symbol, :write_headers => true)
    end
def open_rejects(file)
      # Make the parent directory.
      FileUtils.mkdir_p(File.dirname(file))
      # Open the file.
      FasterCSV.open(file, 'w', :headers => true, :header_converters => :symbol, :write_headers => true)
    end
Makes the rejects CSV output file.

 @param [String] file the output file
 @return [IO] the reject stream