made RootFolderCollection, NotificationCollection singleton.

NzbDrone.Web/_backboneApp/Shared/NotificationCollection.js

@@ -0,0 +1,59 @@
+define(['app', 'Shared/NotificationModel'], function () {
+
+    var collection = Backbone.Collection.extend({
+
+        model: NzbDrone.Shared.NotificationModel,
+        
+        initialize: function () {
+
+            var self = this;
+
+            window.onerror = function (msg, url, line) {
+
+                try {
+                    var model = new NzbDrone.Shared.NotificationModel();
+
+                    var a = document.createElement('a');
+                    a.href = url;
+
+                    model.set('title', a.pathname.split('/').pop() + ' : ' + line);
+                    model.set('message', msg);
+                    model.set('level', 'error');
+                    self.add(model);
+                } catch (error) {
+
+                    console.log("An error occurred while reporting error. " + error);
+                    console.log(msg);
+                    alert('Couldn\'t report JS error.  ' + msg);
+                }
+
+                return false; //don't suppress default alerts and logs.
+            };
+
+            $(document).ajaxError(function (event, xmlHttpRequest, ajaxOptions) {
+
+                //don't report 200 error codes
+                if (xmlHttpRequest.status >= 200 && xmlHttpRequest.status <= 300) {
+                    return undefined;
+                }
+
+                //doesn't report aborted requests
+                if (xmlHttpRequest.statusText === 'abort') {
+                    return undefined;
+                }
+
+                var model = new NzbDrone.Shared.NotificationModel();
+                model.set('title', ajaxOptions.type + " " + ajaxOptions.url + " : " + xmlHttpRequest.statusText);
+                model.set('message', xmlHttpRequest.responseText);
+                model.set('level', 'error');
+                self.add(model);
+
+                return false;
+            });
+        }
+    });
+
+    return new collection();
+});
+
+