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/angular.js

@@ -0,0 +1,36 @@
+/**
+ * Angular.js plugin
+ *
+ * Provides an $exceptionHandler for Angular.js
+ */
+;(function(Raven, angular) {
+'use strict';
+
+// quit if angular isn't on the page
+if (!angular) {
+    return;
+}
+
+function ngRavenProvider($provide) {
+    $provide.decorator('$exceptionHandler', [
+        'RavenConfig', '$delegate',
+        ngRavenExceptionHandler
+    ]);
+}
+
+function ngRavenExceptionHandler(RavenConfig, $delegate) {
+    if (!RavenConfig)
+        throw new Error('RavenConfig must be set before using this');
+
+    Raven.config(RavenConfig.dsn, RavenConfig.config).install();
+    return function angularExceptionHandler(ex, cause) {
+        $delegate(ex, cause);
+        Raven.captureException(ex, {extra: {cause: cause}});
+    };
+}
+
+angular.module('ngRaven', [])
+    .config(['$provide', ngRavenProvider])
+    .value('Raven', Raven);
+
+})(window.Raven, window.angular);