Exit Status Codes

[brandtdamman]

Is your feature request related to a problem? Please describe.
Upon incorrect states of the program, a Python errout will be given with a stack trace.

Describe the solution you'd like
Rather than generic stack trace with a possibly unhelpful error, a custom SlackJP error with user-friendly details on what went wrong and possible solutions would be useful. Additionally, exit status codes would be good for background processing.

Describe alternatives you've considered
Simply no error messages and only exit status codes.