FR: Cromshell support for non-interactive setup

[mbookman]

in order to use cromshell, I need to at some point interactively run cromshell to answer a few questions. The only question that actually needs to be answered is what the Cromwell server URL is; the other prompts are simply confirmation dialogs.

It should be possible to call:

cromshell update-server [URL]

For example:

cromshell update-server localhost:8000