Remove unused SpecHelper

spec/javascripts/helpers/SpecHelper.js

@@ -1,9 +0,0 @@
-beforeEach(function() {
-  this.addMatchers({
-    toBePlaying: function(expectedSong) {
-      var player = this.actual;
-      return player.currentlyPlayingSong === expectedSong && 
-             player.isPlaying;
-    }
-  });
-});