Select default title when renaming a notebook

The default notebook name is Untitled<x>. It is unlikely the user will want to
keep this name or part of it. Instead, select the text in the input field so the
user can easily type over the name and change it.

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

@@ -52,7 +52,7 var IPython = (function (IPython) {
         $([IPython.events]).on('checkpoints_listed.Notebook', function (event, data) {
             that.set_last_checkpoint(data[0]);
         });
-        
+
         $([IPython.events]).on('checkpoint_created.Notebook', function (event, data) {
             that.set_last_checkpoint(data);
         });
@@ -104,7 +104,7 var IPython = (function (IPython) {
                         return false;
                     }
                 });
-                that.find('input[type="text"]').focus();
+                that.find('input[type="text"]').focus().select();
             }
         });
     }