Add from_states_for_event and to_states_for_event methods

[steamwings]

Hi, I'm new to AASM and just recently started using it.

What does this do?

• Add from_states_for_event method to AASM::Base
• Add to_states_for_event method to AASM::Base
• Add respective unit tests

Use case

In my case, I want to create a message indicating which states an object must be in to progress to another state. I ended up writing the code for from_states_for_event and figured it would be nice to have it as an integrated helper.

to_states_for_event is included as a bonus.

Specs passing?

Yes. I ran them all with docker-compose as suggested--except for the rails 4.2 ones due to bundler issues. Also, I had to make a couple small changes to Dockerfile and docker-compose.yml to get them to run on the arm64v8 architecture. Those changes are not included with the PR.

[codeclimate]

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