removed backbone from VS solution,

renamed NzbDrone.Backbone to UI

UI/Missing/MissingCollection.js

@@ -0,0 +1,10 @@
+"use strict";
+define(['app', 'Missing/MissingModel'], function () {
+    NzbDrone.Missing.MissingCollection = Backbone.Collection.extend({
+        url       : NzbDrone.Constants.ApiRoot + '/missing',
+        model     : NzbDrone.Missing.MissingModel,
+        comparator: function (model) {
+            return model.get('airDate');
+        }
+    });
+});