Merge pull request #147 from bekzod/remove-booted-flag

using internal flag `_booted` instead of `instanceBooted`

Author: kratiahuja

src/ember-app.js

@@ -237,7 +237,6 @@ class EmberApp {
 
         return instance.boot(bootOptions);
       })
-      .then(() => result.instanceBooted = true)
       .then(() => instance.visit(path, bootOptions))
       .then(() => fastbootInfo.deferredPromise)
       .then(() => instance);

src/result.js

@@ -10,7 +10,6 @@ const HTMLSerializer = new SimpleDOM.HTMLSerializer(SimpleDOM.voidMap);
  */
 class Result {
   constructor(options) {
-    this.instanceBooted = false;
     this._instanceDestroyed = false;
     this._doc = options.doc;
     this._html = options.html;
@@ -85,7 +84,7 @@ class Result {
   }
 
   _finalizeMetadata(instance) {
-    if (this.instanceBooted) {
+    if (instance._booted) {
       this.url = instance.getURL();
     }