Adding pandoc for notebook conversions.

This package helps ipython to convert notebooks to other formats.
Utility to run notebooks from command line.

This python script reads in an ipython notebook and executes each one of its
cells. This is conveniently done from the command line.

Taken from:

    https://gist.github.com/minrk/2620876

Thanks to Ben Min RK:

    https://github.com/minrk