Remote-docker-aws

Makes it easier to recognize in the ec2 console

Allows `user_id` to be set in JSON configuration to uniquely identify a docker agent, which is useful if you want to use multiple different agents per profile, or in a shared AWS account

Also refactors `core.py` into a class so it's easier to use

Fixes a bug with keypair creation

Bumping with a few changes. No changes needed to be made for the last ~5 days so it's working reliably

This is the first release! Treat as alpha