Thanks for that. One thing I should make clear -- we don't support IPython Notebook servers right now. You might be able to get it running temporarily, but there's no guarantee that it will work or continue to work.
But if this is some kind of IPython Notebook batch processing or something else that doesn't rely on having a server, I think the best thing to do would be to install the package locally in your home directory using
pip install --user packagename
...and then to put the templates insite your ~/.local/lib/python2.7/site-packages/IPython/nbconvert/templates
directory.