libcnab: CNAB library for Rust

This is a highly experimental (and currently unfinished) implementation of CNAB Core 1.0. It is written in Rust.

Progress:

• [x] implement bundle.json structs
• [ ] test deserialize
• [ ] write Canonical JSON
• [ ] read/write bundle.json from files and strings
• [ ] execute a bundle in Docker
• [ ] support custom actions

We're just learning Rust, so we welcome feedback and PRs.