The notebooks in the BigBang examples directory have been version 3 since
the project started.
In the most recent version of IPython, the notebooks have been updated to
v4 to include (among other things?) the language-agnostic Jupyter branding.
I'm going to update these notebooks in a commit soon, as per this issue:
https://github.com/sbenthall/bigbang/issues/174
Please update your IPython packages in your Python environment so that you
can use the new notebooks.
Thanks,
Seb
