Added new short key for cell execution

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

@@ -114,6 +114,10 b' var IPython = (function (IPython) {'
             } else if (event.which === key.ENTER && event.shiftKey) {
                 that.execute_selected_cell();
                 return false;
+            } else if (event.which === key.ENTER && event.altKey) {
+                that.execute_selected_cell();
+                that.insert_cell_above('code');
+                return false;
             } else if (event.which === key.ENTER && event.ctrlKey) {
                 that.execute_selected_cell({terminal:true});
                 return false;

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

@@ -28,6 +28,7 b' var IPython = (function (IPython) {'
         var shortcuts = [
             {key: 'Shift-Enter', help: 'run cell'},
             {key: 'Ctrl-Enter', help: 'run cell in-place'},
+            {key: 'Alt-Enter', help: 'run cell, insert below'},
             {key: 'Ctrl-m x', help: 'cut cell'},
             {key: 'Ctrl-m c', help: 'copy cell'},
             {key: 'Ctrl-m v', help: 'paste cell'},