Add no execute dunder as asked by greg

no_exec_dunder.js

@@ -0,0 +1,17 @@
+
+define(["require"], function(require) {
+    console.log('patching codecell');
+    console.log('old is',IPython.CodeCell.prototype.execute)
+    IPython.CodeCell.prototype.old_execute = IPython.CodeCell.prototype.execute
+
+    IPython.CodeCell.prototype.execute = function () {
+       console.log(this.get_text().match('_{4,}'))
+       if ( ! this.get_text().match('_{4,}') ){
+           console.log('oe');
+           this.old_execute(arguments); // not sure of the unpacking of arguments here, might be [arguments]
+       } else {
+           this.output_area.element.text('not quite there yet you still have to many ____')
+       }
+    };
+    
+});