Extract runInjections from Application#initialize

This also runs the injections on the newly created router property,
because we collect the keys after adding the router. But this shouldn't
do any harm.

Author: joliss

packages/ember-application/lib/system/application.js

@@ -315,9 +315,6 @@ Ember.Application = Ember.Namespace.extend(
     @param router {Ember.Router}
   */
   initialize: function(router) {
-    var injections = get(this.constructor, 'injections'),
-        namespace = this;
-
     if (!router && Ember.Router.detect(this.Router)) {
       router = this.Router.create();
       this._createdRouter = router;
@@ -335,7 +332,24 @@ Ember.Application = Ember.Namespace.extend(
       set(router, 'namespace', this);
     }
 
-    var graph = new Ember.DAG(), i, injection;
+    this.runInjections(router);
+
+    Ember.runLoadHooks('application', this);
+
+    // At this point, any injections or load hooks that would have wanted
+    // to defer readiness have fired.
+    this.advanceReadiness();
+
+    return this;
+  },
+
+  /** @private */
+  runInjections: function(router) {
+    var injections = get(this.constructor, 'injections'),
+        graph = new Ember.DAG(),
+        namespace = this,
+        properties, i, injection;
+
     for (i=0; i<injections.length; i++) {
       injection = injections[i];
       graph.addEdges(injection.name, injection.injection, injection.before, injection.after);
@@ -347,14 +361,6 @@ Ember.Application = Ember.Namespace.extend(
         injection(namespace, router, property);
       });
     });
-
-    Ember.runLoadHooks('application', this);
-
-    // At this point, any injections or load hooks that would have wanted
-    // to defer readiness have fired.
-    this.advanceReadiness();
-
-    return this;
   },
 
   didBecomeReady: function() {