v0.3.1

Fixed

• Check stages run, including those declaring no runtime or model configuration. (#166)
• An interactive stage reports a refused credential as a failure the agent is not answerable for, and
  stops advertising that runtime. (#166)
• dahrk status describes only the running process, never a previous run's failure. (#165)
• dahrk start waits up to ten seconds for the node to reach the hub before reporting on it. (#165)
• dahrk status reads only the most recent portion of the log. (#165)