def wraith_percentage(file, browser_output)
        file_object = File.open(file, 'rb')
        browser_output[:percent_changed] ||= {}
        browser_output[:percent_changed][File.basename(file).split('_')[0].to_i] = file_object.read.to_f

        file_object.close

        browser_output
      end
def wraith_percentage(file, browser_output)
        file_object = File.open(file, 'rb')
        browser_output[:percent_changed] ||= {}
        browser_output[:percent_changed][File.basename(file).split('_')[0].to_i] = file_object.read.to_f

        file_object.close

        browser_output
      end
Grab the percentage change from previous snapshots
 @since 0.1.5
 @param file [String]
 @param browser_output [Hash]
 @return [Hash]