Check if Ghost process died

[kirrg001]

I am starting Ghost with ghost start.
It shows me ✔ Starting Ghost instance.
But Ghost is not running, because the process died.

Suggestion: Ensure process is alive for X and show Error if process died.

[acburdine]

Initial work for this has been done as a part of 0041693 - will close this when ghost has the ability to output process messages when it has started.

[acburdine]

Closed by #81