def token_count_across_categories(token)
      data.keys.inject(0){|sum, cat| sum + @data[cat][:tokens][token] }
    end
def token_count_across_categories(token)
      data.keys.inject(0){|sum, cat| sum + @data[cat][:tokens][token] }
    end
XXX - TODO - use count_of_token_in_category
 Return the total number of tokens we've seen across all categories