Directory detection fails if you specify port 80

[Isona]

If you run Dirble with a URL containing port 80 or 443 as follows http://[url]:80, most websites will redirect without the port number, breaking directory detection.
This would be fixed by removing :80 and :443 if the given url begins with http:// or https:// respectively.

Invoked as:
dirble http://[url]:80
Output line showing the issue:
+ http://[url]:80/javascript (CODE:301|SIZE:317|DEST:http://[url]/javascript/