New Added client-side Sentry logging

Using Raven.js allows logging client-side javascript errors to the
configured Sentry server.

htdocs/includes/raven-js/plugins/ember.js

@@ -0,0 +1,29 @@
+/**
+ * Ember.js plugin
+ *
+ * Patches event handler callbacks and ajax callbacks.
+ */
+;(function(window, Raven, Ember) {
+'use strict';
+
+// quit if Ember isn't on the page
+if (!Ember) {
+    return;
+}
+
+var _oldOnError = Ember.onerror;
+Ember.onerror = function EmberOnError(error) {
+    Raven.captureException(error);
+    if (typeof _oldOnError === 'function') {
+        _oldOnError.call(this, error);
+    }
+};
+Ember.RSVP.on('error', function (reason) {
+    if (reason instanceof Error) {
+        Raven.captureException(reason, {extra: {context: 'Unhandled Promise error detected'}});
+    } else {
+        Raven.captureMessage('Unhandled Promise error detected', {extra: {reason: reason}});
+    }
+});
+
+}(window, window.Raven, window.Ember));