TODO: Be able to show configurable information

[CatoAntonsen]

http://raspberrypi:4000/api/info/metadata returns something like this:

{
  "album_name": "Cool Girl", 
  "album_uri": "spotify:album:4FCHbA6YstX6lBJq7UKWMR", 
  "artist_name": "Tove Lo", 
  "artist_uri": "spotify:artist:4NHQUGzhtTLFvgF5SZesLK", 
  "context_uri": "spotify:user:spotify_norway_:playlist:6FDSXAbjyCOGDbnJtG5Y8Z", 
  "cover_uri": "spotify:image:103123101a5471136be5749e436b1ff85a8d8b81", 
  "data0": "New Music Friday Norway", 
  "duration": 197815, 
  "track_name": "Cool Girl", 
  "track_uri": "spotify:track:6vJ0Fezf6Etha2C4H21FKO", 
  "volume": 21299
}