The Spotify plugin has been DEPRECATED
The Spotify Plugin has been immediately deprecated (August 2016), because the API it was based on (The Spotify Metadata API) has been ended. Since this rendered the plug-in broken, there was no need to forewarn of the deprecation.
Please consider moving to the new general music services code (in soco.music_services.music_service), that makes it possible to retrived information about the available media from all music services. A short intro for how to use the new code is available in the API documentation:
and for some information about how to add items from the music services to the queue, see this gist:
This deprecation notification will be deleted for the second release after 0.12.