Sending data back to python object after slider values change

IPython/html/static/widgets/js/widget_int.js

@@ -77,6 +77,7 b' define(['
                 this.model.set('value', value, {updated_view: this});
                 this.$slider.slider('option', 'value', value);
                 this.$readout.text(value);
+                this.touch()
 
                 // Use the right CSS classes for vertical & horizontal sliders
                 if (orientation=='vertical') {