Working on new_project_from_exemplar.py

I used @tzlaine 's script to convert to a cookiecutter, making all the options things like “{{cookiecutter.description}}”, then fixed up things that cookiecutter complained about. That is:

./new_project_from_exemplar.py --owner '{{cookiecutter.owner}}' --paper '{{cookiecutter.paper}}' --cpp-version '999' --desc '{{cookiecutter.description}}' '{{cookiecutter.project_name}}'