Feature Request: Ability to retrieve a container object by attributes

[CpuID]

Example: https://github.com/mauricioklein/docker-compose-api/blob/master/README.md

compose.get_containers_by(label: 'foo', name: 'bar') # Returns an array of all containers with label = 'foo' and name = bar

Right now there doesn't seem to be an ability to fetch an object with the current running container attributes, which is preventing me from using this gem. Would it be possible to get something similar?

[xeger]

I prototyped this for you, @CpuID: #21

Let me know if it meets your needs; I'll tweak and/or add some tests sometime tomorrow.

[CpuID]

Thanks! I'll take a look and report back.

[CpuID]

@xeger comments in the PR - re one part of the functionality. Otherwise looking good :)