Merge pull request #6650 from jdfreder/widg_int_test

!! Fix Travis

IPython/html/tests/widgets/widget_int.js

@@ -162,7 +162,7 b' casper.notebook_test(function () {'
         'print("Success")\n');
     this.execute_cell_then(index, function(index){
         this.test.assertEquals(0, 0, 'Invalid int range max bound does not cause crash.');
-    }); 
+    }, true); 
 
     index = this.append_cell(
         'a = widgets.IntSlider()\n' +
@@ -171,5 +171,5 b' casper.notebook_test(function () {'
         'print("Success")\n');
     this.execute_cell_then(index, function(index){
         this.test.assertEquals(0, 0, 'Invalid int range min bound does not cause crash.');
-    });
+    }, true);
 });
  No newline at end of file