Finished the queue and spotifiy interaction layer

This pull request completes the queues interaction with spotify as well as add's behat tests for use. The behat tests outlines a series of scenarios that I believe will happen when joog-streamer and joog.io meet. The behat tests outlines adding to the firebase server and the queue responding accordingly, play commands sent back and forth between joogs and joog.io, and infinite loop (which is already setup and working!)