Since the test suite is inlined, it makes sense to also have the test data installed alongside the test modules.
So all the content of the two top-level folders Data and TestData is now placed inside Lib/ufoLib/test/testadata.
The MANIFEST.in has been adjusted accordingly.
The `install_package_data` in setup.py ensures the package data specified in the manifest is installed with the package.
This way anyone who installs ufoLib (even the wheel from PyPI) can run the test suite with `pytest --pyargs ufoLib`.
The `url` field in setup.py must be the home page for the package.
I moved the url to the UFO spec in the 'long_description', so it will show up in the PyPI project page.
Checking for `import fontTools` is redundant since dependency resolution is now automatic.
