Rust libz blitz!

Argh, it looks like I missed the status update last week again, and I’m not going to get it done today. Sorry for falling behind, but I will catch up next week. Thank you so much @KodrAus, @budziq, and @burntsushi for keeping things moving :heart:

Next week I will endeavor to catch up on reviews, open the rand evaluation, resolve a number of guidelines issues, and close out some of the early evaluations with version bumps and releases.

It came to my attention recently that CC0 would be more a more appropriate license for the cookbook, so I filed an issue against it: https://github.com/brson/rust-cookbook/issues/209