Add missing require for urlparse

This was removed as part of a refactoring in 5ecb9318a95ce5ac4b945f493cd2644e63a5e4ee
but it should have been kept since dd1b6ec9eda3a81ead2bdf3662d849b3d2ee5c8c
introduced extra uses of that module.
Merge pull request #31 from fmarier/fix_broken_build

Add missing require for urlparse