Add handling of twitter avatars: if they do not load, then a default image will be used

static/js/app.js

@@ -4352,6 +4352,27 @@ quayApp.directive('buildProgress', function () {
 });
 
 
+quayApp.directive('twitterView', function () {
+  var directiveDefinitionObject = {
+    priority: 0,
+    templateUrl: '/static/directives/twitter-view.html',
+    replace: false,
+    transclude: true,
+    restrict: 'C',
+    scope: {
+      'avatarUrl': '@avatarUrl',
+      'authorName': '@authorName',
+      'authorUser': '@authorUser',
+      'messageUrl': '@messageUrl',
+      'messageDate': '@messageDate'
+    },
+    controller: function($scope, $element) {
+    }
+  };
+  return directiveDefinitionObject;
+});
+
+
 quayApp.directive('notificationView', function () {
   var directiveDefinitionObject = {
     priority: 0,
@@ -4747,6 +4768,18 @@ quayApp.directive('tagSpecificImagesView', function () {
 });
 
 
+quayApp.directive('fallbackSrc', function () {
+  return {
+    restrict: 'A',
+    link: function postLink(scope, element, attributes) {
+      element.bind('error', function() {
+        angular.element(this).attr("src", attributes.fallbackSrc);
+      });
+    }
+  };
+});
+
+
 // Note: ngBlur is not yet in Angular stable, so we add it manaully here.
 quayApp.directive('ngBlur', function() {
   return function( scope, elem, attrs ) {