I guess they got rid of grizzly.

Now let's use havana.  Only it still doesn't quite work.  But this is
closer.

Also, I don't like caching files like this was doing... pypi is great at
caching files that pip eats.  So I got rid of that.
Merge pull request #1 from swiftstack/rip-grizzly

I guess they got rid of grizzly.