removed backbone from VS solution,

renamed NzbDrone.Backbone to UI

UI/AddSeries/RootFolders/RootFolderModel.js

@@ -0,0 +1,14 @@
+"use strict";
+define(['app'], function () {
+    NzbDrone.AddSeries.RootFolders.RootFolderModel = Backbone.Model.extend({
+        mutators: {
+            freeSpaceString: function () {
+                return this.get('freeSpace').bytes(2) + " Free";
+            }
+        },
+
+        defaults: {
+            freeSpace: 0,
+        }
+    });
+});