Update for latest RABL version:

* Fix controller specs to also render RABL views where needed.

spec/controllers/api/playlists_controller_spec.rb

@@ -8,6 +8,8 @@ describe API::PlaylistsController do
   end
 
   describe 'GET index' do
+    render_views
+
     before do
       playlist_1 = Factory.create(:playlist, :name => 'Playlist 1')
       playlist_2 = Factory.create(:playlist, :name => 'Playlist 2')

spec/controllers/api/tracks_controller_spec.rb

@@ -8,6 +8,8 @@ describe API::TracksController do
   end
 
   describe 'GET index' do
+    render_views
+
     before do
       Factory.create(:track_with_sound)
       Factory.create(:track_with_sound)