#3 Support Zip64.

[Bill Bell]

I would like rubyzip to support zip64 format.

Requirement
- Support >4G zip archives.
- Zip64 archives must be readable by WinZip 11.
- List, extract, add and delete files in archive.
- Run on PC, Linux32 and Linux64.

Issues
- Seems spec for zip64 is somewhat vague. Needs to be interoperable with Winzip 11.
- Unclear on Info-Zip and Perl IO::Compress::Zip compatibility.