Add actions for starting, stopping, and restarting the containers

@ngmiller I'm opening this. I haven't tested it out yet. Do you think there is anything else required for these?
Depends on the return value from the Docker API. These calls in particular don't return any data per se, just specific status codes. So the success callbacks will have to modify the view state in some way (to show started, stopped, etc) and the error will have to delegate to the alertService (which can just have a TODO placeholder for now)