It's really minor, but thought I'd mention it...

Document typo at sys::Zip.gzipInStream:

**
** Construct a new GZIP input stream which wraps the given output stream.
**
static InStream gzipInStream(InStream out)

should be

**
** Construct a new GZIP input stream which wraps the given **input** stream.
**
static InStream gzipInStream(InStream **in**)

Same goes for sys::Zip.read:

const static Zip read(InStream **in**)

Thanks - I pushed a fix