Use HTTPS everywhere possible

Author: PowerKiKi

demo/index.html

@@ -4,8 +4,8 @@
         <meta charset="utf-8">
         <title>AngularJS ui-event</title>
 
-        <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular.js"></script>
-        <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.css">
+        <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular.js"></script>
+        <link rel="stylesheet" href="https://netdna.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.css">
 
         <!-- ui-event files -->
         <script src="../dist/event.js"></script>