Unicode fixes

Hi Patricia, we're almost there! The build was still failing, so I looked into it. Maybe it's something about your text editor, but it looks like there are three more unicode changes that needed to be made in order for your paper to build on my machine. Since I'd already made the changes locally to check the build, I thought I would just pull request to your pull request. You'll see the changes if you click "Files Changed" above. They're pretty simple. 

If you approve of them, you can press the merge button at the bottom and these changes will be part of your pull request to scipy master. 

If you'd rather make these changes yourself, go right ahead. We'll be able to pull your paper when the paper building bot (stefan.pythonanywhere.com) successfully builds your paper (which I think will happen when these changes are made).