zip normative reference

[Alex Heneveld <alex.heneveld@cloudsoftcorp.com>]

Hi Anish, All-

For the ZIP reference, you supplied this:

    http://www.pkware.com/documents/casestudies/APPNOTE.TXT

It appears this changes as ZIP versions update.  Would we not be better 
off using:

    http://www.pkware.com/documents/APPNOTE/APPNOTE-6.3.3.TXT

Best
Alex