Topo2: Refactored Maps and Sprites to be managed by a BackgroundService

Change-Id: I75965fc76734436ce0c68e06dd75663baa924287
diff --git a/web/gui/src/main/webapp/index.html b/web/gui/src/main/webapp/index.html
index f053f02..3930779 100644
--- a/web/gui/src/main/webapp/index.html
+++ b/web/gui/src/main/webapp/index.html
@@ -134,6 +134,7 @@
     <!-- Under development for Region support. -->
     <!--<script src="app/view/topo2/topo2.js"></script>
     <script src="app/view/topo2/topo2Breadcrumb.js"></script>
+    <script src="app/view/topo2/topo2Background.js"></script>
     <script src="app/view/topo2/topo2Collection.js"></script>
     <script src="app/view/topo2/topo2D3.js"></script>
     <script src="app/view/topo2/topo2Dialog.js"></script>