Chapter 7: Update SearchResultsController to include viewedArtist and viewedSong actions.
Chapter 7: Update SearchResultsController to include transitionToRoute.
Chapter 7: Install the LocalStorageAdapter.
Chapter 7: Switch from the FixtureAdapter to the LocalStorageAdapter.
Chapter 7: Scope the LocalStorageAdapter to the Activity model.
Chapter 7: Add an Application Initializer to seed the Ember Data Store with 300 activities.