This was causing offline pip installs to fail for some weird reason:
The 'setuptools_scm>=1.15.0' distribution was not found and is required by the application
Even though it is there. v2.x still works.
We `pip download` this file for offline installs. Automat lists this package as a setup_requires, but `pip download` doesn’t resolve these dependencies (distutils will attempt to install them via easy_install when setup.py is invoked).
