Allow parsing all container attributes

[hicham-haouari]

Description

Currently, docker-compose-api parses a static set of attributes

How to reproduce

Try to get the attribute mem_limit for example

What do you expect

Get all container attributes

What happened instead

Only some attributes are returned

Software:

• Ruby version: ruby 2.0.0p648 (2015-12-16) [x86_64-linux]
• Docker-compose-api gem version: docker-compose-api (1.1.5)

[mauricioklein]

Thanks for your contribution.
This is planned on the major refactoring I'm working on.
I expect to be able to release it on v2.0.0, still with no prevision of conclusion.
Thanks!