docker_compose-rs: Support for working with docker-compose.yml files

This is a work in progress! Most of services: is supported, but I'm still refining the APIs as higher-level tools get build around this.

API Documention

You can build this library using stable Rust version 1.11. But if you want to develop it, you will get much better error messages using a nightly build of Rust.

```sh

Install Rust stable and nightly using rustup.

curl -sSf https://static.rust-lang.org/rustup.sh | sh rustup toolchain install nightly

Build unit tests using nightly Rust.

rustup run nightly cargo test --no-default-features --features unstable ```

Sponsor

Faraday logo

Part of the work on [docker_compose-rs] has been generously sponsored by Faraday for use in their conductor tool, which orchestrates docker-compose for large, multi-pod apps.