Node Podcast Downloader

• Download podcasts from subscriptions.json
• mode can be set to either "latest" or "all"

TODO

• Improve Feedback
• Abstract Location to CLI variable
• Log Downloads to prevent repition
• Adapt URL mapper to recursively look though entire post object for url
  • Use regex to find strings that start 'http' and end 'mp3'
  • check enclosures first (prioritise standards and reduce workload)