software/ipython_notebook: Add renderjs extension and jupyter config dirs

The following is added:

• Creation of directories jupyter_data, jupyter_config and subdirectories to put extension/config files in the correct directories (juypter changed policy on where such files should be placed)
• Download of [renderjs_nbextension from pypi}(https://pypi.python.org/pypi/renderjs-nbextension) as source egg (contains config, html and js files)
• Sym-linking these files from the egg-directory into the correct directories jupyter_data/* or jupyter_config/*

Test were requested by @klaus and complete successfully.