Update CDN firebase link to 3.6.0 version (#883)

Author: Loksly

README.md

@@ -44,7 +44,7 @@ In order to use AngularFire in your project, you need to include the following f
 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
 
 <!-- Firebase -->
-<script src="https://www.gstatic.com/firebasejs/3.4.1/firebase.js"></script>
+<script src="https://www.gstatic.com/firebasejs/3.6.0/firebase.js"></script>
 
 <!-- AngularFire -->
 <script src="https://cdn.firebase.com/libs/angularfire/2.1.0/angularfire.min.js"></script>

docs/guide/introduction-to-angularfire.md

@@ -60,7 +60,7 @@ AngularFire bindings from our CDN:
 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
 
 <!-- Firebase -->
-<script src="https://www.gstatic.com/firebasejs/3.3.0/firebase.js"></script>
+<script src="https://www.gstatic.com/firebasejs/3.6.0/firebase.js"></script>
 
 <!-- AngularFire -->
 <script src="https://cdn.firebase.com/libs/angularfire/2.0.1/angularfire.min.js"></script>

docs/quickstart.md

@@ -20,7 +20,7 @@ In order to use AngularFire in a project, include the following script tags:
 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
 
 <!-- Firebase -->
-<script src="https://www.gstatic.com/firebasejs/3.3.0/firebase.js"></script>
+<script src="https://www.gstatic.com/firebasejs/3.6.0/firebase.js"></script>
 
 <!-- AngularFire -->
 <script src="https://cdn.firebase.com/libs/angularfire/2.0.1/angularfire.min.js"></script>