Remove debug print statements in container tests

IPython/html/tests/casperjs/test_cases/widgets_container.js

@@ -15,7 +15,6 b' casper.notebook_test(function () {'
         'print("Success")\n');
     this.execute_cell_then(container_index, function(index){
 
-        print(this.get_output_cell(index).text);
         this.test.assert(this.get_output_cell(index).text == 'Success\n', 
             'Create container cell executed with correct output.');
 

IPython/html/tests/casperjs/test_cases/widgets_multicontainer.js

@@ -18,8 +18,7 b' casper.notebook_test(function () {'
         'multicontainer.selected_index = 0\n' +
         'print("Success")\n');
     this.execute_cell_then(multicontainer1_index, function(index){
-        print(this.get_output_cell(index, 0).text);
-        print(this.get_output_cell(index, 1).text);
+        
         this.test.assert(this.get_output_cell(index).text == 'Success\n', 
             'Create multicontainer cell executed with correct output. (1)');