Backbone app: Add base.js

architecture-examples/backbone/index.html

@@ -52,6 +52,7 @@
 		<button id="clear-completed">Clear completed (<%= completed %>)</button>
 		<% } %>
 	</script>
+	<script src="../../assets/base.js"></script>
 	<script src="../../assets/jquery.min.js"></script>
 	<script src="js/lib/underscore-min.js"></script>
 	<script src="js/lib/backbone-min.js"></script>