Revision of the Cython lab. It is really long now, but the examples should
make it quicker to work through.
Merge pull request #221 from insertinterestingnamehere/cython

Revision of the Cython lab.
Fixed some strange latex behavior in volume 2 and fixed two captions in
Cython lab.
Merge pull request #222 from insertinterestingnamehere/typos

Fixed some strange latex behavior in volume 2
Fixed a spacing issue.
Merge pull request #223 from insertinterestingnamehere/typos

Fixed a spacing issue.
Merge branch 'fixes' of https://github.com/jhendr/numerical_computing into fixes
Small fixes to labs.