Add social platform integration

[corbled]

Add the ability to link different social media accounts allowing easier invitation of friends. Once invited user could view playlist and choose to join as a member.

Possibilities include Facebook, Google contacts, Spotify, etc.

[adilanchian]

I am not 100% on this on because I think we are going to end up having way too many service providers to hook. Let's start with the first main 3 and see what people say