Feature/support autodeploy environments (#136)
Feature/support autodeploy environments (#136)

* apply isort to the import block on ef_service_registry.py

Also, fix the relative-import of efopen.ef_config.

* Factor out the "ephemeral" environment name expansion, for later reuse

* Add a service-registry field 'auto_deploy_environments'

This field can be either a boolean true/false in which case it allows
auto-deploying all the service's environments, or it can be a list
of environment names, to allow for specific environments to be auto-
deployed but not others.

* revising the comments

crunchyroll/ef-open