increase duration of save messages

and write permanent 'failed' message to the save status area on failed save.

IPython/frontend/html/notebook/static/js/notificationwidget.js

@@ -85,10 +85,10 b' var IPython = (function (IPython) {'
             that.set_message("Saving notebook",500);
         });
         $([IPython.events]).on('notebook_saved.Notebook', function () {
-            that.set_message("Notebook saved",500);
+            that.set_message("Notebook saved",2000);
         });
         $([IPython.events]).on('notebook_save_failed.Notebook', function () {
-            that.set_message("Notebook save failed",500);
+            that.set_message("Notebook save failed",2000);
         });
     };
 

IPython/frontend/html/notebook/static/js/savewidget.js

@@ -52,7 +52,7 b' var IPython = (function (IPython) {'
             that.update_document_title();
         });
         $([IPython.events]).on('notebook_save_failed.Notebook', function () {
-            that.set_save_status('');
+            that.set_save_status('Last Save Failed!');
         });
     };