Log Message:
Updated package to latest version (1.06) and made it compatible with
ocaml 4.03 and the latest framework version. Discussed on packages@ and
OK'd by jperkin.

Changes include:
- Switch to "safe string" mode.  Some API functions that use to take
  strings now take byte sequences instead.  OCaml 4.02 or up is required.
- Update for OCaml 4.03.
- Avoid Zlib error when calling Gzip.output with length = 0.
- Improve support for ZIP files / ZIP file members greater than 2 Gbytes.