Add fields that are missing to the global config

[klehrke-sonatype]

Goals:

• Add fields that are missing with defaults (if safe) ** At a minimum maybe documentation of all the config options
• Fix seg faults when running with old version of config ** It dereferences nil pointer if the config doesn't have the option.

[ken-duck]

Would be nice to be able to set the log level as well. I currently hard-code it to "warn".