Some auth and other updates

[HendrikPetertje]

Hey Mustafa Ansari,

Had bit of a hard time finding any means of contacting you, so I'll just write here.

Thanks for making an awesome plugin man! I know, Vim is not made for these kind of big things, but it's still cool to hack!
Your plugin stopped working a few months ago after Spotify's API updates. I've been working a bit on it and wanted to integrate some more stuff into it (like previous, next, quickfix integration and some code sorting).

I hope that's okay, I have no problems with opening up a pull-request here once the basics are all lined out. Lemme know what you think and want or not want! You can just reply here or close this topic and reach out trough the details on my Github user profile

// Peter