v0.3.0

• Change default config filename (yes, again) from mission.json to mission.config.json.
• Add storage directory validation to spotify task.
• Make passBin optional.
• Make storage directories fully configurable.
• Use a type string key to specify task type instead of a bool.
• Don't show headers for sections (chown and commit) when there is nothing to do.
• Various code cleanups.