Hw5 branch

Hi Jake,

This pull request should include my fifth homework and the associated animation.  Please let me know if it does not.  

Also, I found today's lecture super useful.  Because I run Global Circulation Models (GCMs), which are all written in thousands upon thousands of codes of Fortran 90 (and a little C), I can imagine scenarios in the future when this might come in handy.  Though I don't mind writing in Fortran. 

Thanks!
Elizabeth