Made checkbox and togglebutton compatable with disabled property

IPython/html/static/notebook/js/widgets/bool.js

@@ -34,6 +34,9 b' require(["notebook/js/widget"], function(){'
             if (!this.user_invoked_update) {
                 this.$checkbox.prop('checked', this.model.get('value'));
 
+                var disabled = this.model.get('disabled');
+                this.$checkbox.prop('disabled', disabled);
+
                 var description = this.model.get('description');
                 if (description.length == 0) {
                     this.$label.hide();
@@ -75,6 +78,9 b' require(["notebook/js/widget"], function(){'
                     this.$button.removeClass('active');
                 }
 
+                var disabled = this.model.get('disabled');
+                this.$button.prop('disabled', disabled);
+
                 var description = this.model.get('description');
                 if (description.length == 0) {
                     this.$button.html(' '); // Preserve button height