fr33jc

Show helpful error if user is missing provider creds in bangrc

1

The following line raises a KeyError if it's missing and users are not sure how to proceed: ``` bang/deployers/cloud.py", line 496, in get_deployers provider = get_provider(pname, creds[pname]) KeyError: 'aws' ```

The console output should obey the user-configurable logging settings. Unknown exceptions should have a reasonable summary logged as ERROR. All tracebacks should go into a detailed error log. Note that...