Initial MVP

This is the MVP (stable operation) for scrobbling spotify plays to Majola:

• Triaged configuration possibilities using environment variables json objects, and json files
• Handles spotify authentication when user visits callback, or uses existing access/refresh token if provided
• Handles re-authenticating spotify as needed
• Logging debug/info to stderr/out and rotating log files
• Dockerized config dir and optionally logging dir using environmental variables