Load gravatar image securely if needed

src/Umbraco.Web.UI.Client/src/common/services/user.service.js

@@ -233,7 +233,7 @@ angular.module('umbraco.services')
                             }
 
                             setCurrentUser(data);
-                            currentUser.avatar = 'http://www.gravatar.com/avatar/' + data.emailHash + '?s=40&d=404';
+                            currentUser.avatar = '//www.gravatar.com/avatar/' + data.emailHash + '?s=40&d=404';
                             deferred.resolve(currentUser);
                         });
 
@@ -251,4 +251,4 @@ angular.module('umbraco.services')
             }
         };
 
-    });
+    });