make embed_path dynamic to support https access

source/embed/index.html

@@ -39,7 +39,12 @@
   <div id="timeline-embed"></div>
   <!-- Override -->
   <script type="text/javascript">
-    var embed_path = "http://cdn.knightlab.com/libs/timeline/latest/";
+    var trim_point = window.location.href.indexOf('embed/index.html');
+    if (trim_point > 0) {
+      var embed_path = window.location.href.substring(0,trim_point); // supports https access via https://s3.amazonaws.com/cdn.knightlab.com/libs/timeline/latest/embed/index.html 
+    } else {
+      var embed_path = "http://cdn.knightlab.com/libs/timeline/latest/";
+    }
   </script>
   <!-- build:js ../js/storyjs-embed-cdn.js?v214 -->
   <script type="text/javascript">