Add in-progress commit status change indicator

When deploying a changeset there is a time between when the ecs sends the command and juju ack's it. This time can be quite large on large deployments and on slow environments. This now changes the blue circle in the machine view to a yellow one until the juju ack.
Yeah sorry I can add a comment here. We will eventually add services, relations, etc so here is where we'd specify the appropriate list.