Remove text repr of js includes.

IPython/html/widgets/widget.py

@@ -36,7 +36,7 b' def init_widget_js():'
         if not (name == 'widget' or name == '__init__') and name.startswith('widget_'):
             # Remove 'widget_' from the start of the name before compiling the path.
             js_path = '/static/notebook/js/widgets/%s.js' % name[7:]
-            display(Javascript(data='$.getScript("%s");' % js_path))  
+            display(Javascript(data='$.getScript("%s");' % js_path), exclude="text/plain")  
 
 
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