bug fixes for headroom

src/scripts/librarymenu.js

@@ -724,7 +724,8 @@ define(["dom", "layoutManager", "inputManager", "connectionManager", "events", "
     }
 
     function initHeadRoom(elem) {
-        require(["headroom"], function (headroom) {
+        require(["headroom"], function (Headroom) {
+            var headroom = new Headroom([], {});
             headroom.add(elem);
         });
     }

src/scripts/site.js

@@ -345,7 +345,6 @@ var AppInfo = {};
 
     function createWindowHeadroom(Headroom) {
         var headroom = new Headroom([], {});
-        headroom.init();
         return headroom;
     }