fix typo in method name

IPython/html/static/tree/js/main.js

@@ -74,7 +74,7 @@ $(document).ready(function () {
     
     // bound the upload method to the on change of the file select list
     $("#alternate_upload").change(function (event){
-        IPython.notebook_list.handelFilesUpload(event,'form');
+        IPython.notebook_list.handleFilesUpload(event,'form');
     });
     
     // set hash on tab click

IPython/html/static/tree/js/notebooklist.js

@@ -47,12 +47,12 @@ var IPython = (function (IPython) {
             return false;
         });
         this.element.bind('drop', function(event){
-            that.handelFilesUpload(event,'drop');
+            that.handleFilesUpload(event,'drop');
             return false;
         });
     };
 
-    NotebookList.prototype.handelFilesUpload =  function(event, dropOrForm) {
+    NotebookList.prototype.handleFilesUpload =  function(event, dropOrForm) {
         var that = this;
         var files;
         if(dropOrForm =='drop'){