Update router.js to bc22bb4d5 For didTransition

Update the router.js for https://github.com/tildeio/router.js/pull/52

Allows:

```JavaScript
App.ApplicationRoute = Ember.Route.extend({
  actions: {
    didTransition: function(){
      var router = this.router;
      Ember.run.once(function(){
        // Track this pageview with Google analytics
        _gaq.push(['_trackPageview', router.get('url')]);
      });
    }
  }
});

App.LeafyRoute = Ember.Route.extend({
  actions: {
    didTransition: function(){
      // Just to give an idea, I have not done this.
      this.controllerFor('breadcrumbs').send('addCrumb', 'leafy');
      return true; // Bubble to track analytics
    }
  }
});
```