Jupyter Notebook; Nbviewer not displaying widgets

Question

After you read this post, I just upgraded to Jupyter / Python 3.4, so the widgets actually appear when using Nbviewer. Alas, this does not seem to work. In fact, not one of the interactive widgets from the examples will be displayed on nbviewer - except for the frequencies of one bit .

Any ideas why this might not work?

Any alternative suggestions on how to make it work are very welcome. Here is a link to a bit of code I'm trying to show sliders in nbviewer, and here is a github link.

Thanks!