Use index/loading template instead of IndexLoadingRoute

By default Ember.js will use either IndexLoadingRoute or index/loading
template. Before this commit we were specyfing IndexLoadingRoute, which
was renderring index_loading template. This is not needed as long as we
use index/loading template - the effect is the same, but we use a
default.

assets/scripts/app/routes.coffee

@@ -268,10 +268,6 @@ Travis.IndexRoute = Ember.Route.extend
     @container.lookup('controller:repos').activate()
     @container.lookup('controller:application').connectLayout 'home'
 
-Travis.IndexLoadingRoute = Ember.Route.extend
-  renderTemplate: ->
-    @render('index_loading')
-
 Travis.StatsRoute = Ember.Route.extend
   renderTemplate: ->
     $('body').attr('id', 'stats')