`find_packages` does not seem to work correctly when the working directory does not equal the package directory (resulted in the actual module not being installed).
Fix this by changing the working directory during setup.
Ran python-modernizer, this fixed most of the Python 3
incompatibilities.
Had to manually rework the iteration in svg_regex and svg_transform;
.next doesn't exist in Python 3. Wrapped the builtin next function in a
partial for equivalent functionality.
