PRX/PRXPlayer — pull request #10 by jballanc (2014-11-13 16:16:41+00:00)
Title: Move logic from `playerItem` change observer to setter

Instead of registering the `PRXPlayer` as an observer to itself, this
moves the logic that was in the `playerItem` observer to the
`setPlayerItem` method. In order to still be able to forward change
notifications to the delegate, a "fake" change dictionary is created and
passed along.