setuptools: Installation of packages fails after 28.7.0 upgrade: Documentation object is not iterable

Getting a weird error: TypeError: 'Documentation' object is not iterable trying to install rjsmin in a brand new virtualenv with the latest setup tools. This is on Ubuntu 16.0.4 and my OS X machine does the same thing.

ubuntu@staging:~$ virtualenv env
New python executable in /home/ubuntu/env/bin/python
Installing setuptools, pip, wheel...done.
ubuntu@staging:~$ source env/bin/activate
(env) ubuntu@staging:~$ pip install rjsmin
Collecting rjsmin
  Using cached rjsmin-1.0.12.tar.gz
    Complete output from command python setup.py egg_info:
    running egg_info
    creating pip-egg-info/rjsmin.egg-info
    writing pip-egg-info/rjsmin.egg-info/PKG-INFO
    writing top-level names to pip-egg-info/rjsmin.egg-info/top_level.txt
    writing dependency_links to pip-egg-info/rjsmin.egg-info/dependency_links.txt
    writing manifest file 'pip-egg-info/rjsmin.egg-info/SOURCES.txt'
    warning: manifest_maker: standard file '-c' not found

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-EeZDjY/rjsmin/setup.py", line 42, in <module>
        setup()
      File "/tmp/pip-build-EeZDjY/rjsmin/setup.py", line 33, in setup
        return run(script_args=args, ext=ext, manifest_only=_manifest)
      File "_setup/py2/setup.py", line 421, in run
        return _core.setup(**kwargs)
      File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
        dist.run_commands()
      File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
        self.run_command(cmd)
      File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
        cmd_obj.run()
      File "/home/ubuntu/env/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 279, in run
        self.find_sources()
      File "/home/ubuntu/env/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 306, in find_sources
        mm.run()
      File "/home/ubuntu/env/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 533, in run
        self.add_defaults()
      File "/home/ubuntu/env/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 562, in add_defaults
        sdist.add_defaults(self)
      File "/home/ubuntu/env/local/lib/python2.7/site-packages/setuptools/command/py36compat.py", line 35, in add_defaults
        self._add_defaults_data_files()
      File "/home/ubuntu/env/local/lib/python2.7/site-packages/setuptools/command/py36compat.py", line 111, in _add_defaults_data_files
        dirname, filenames = item
    TypeError: 'Documentation' object is not iterable

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-EeZDjY/rjsmin/
(env) ubuntu@staging:~$ pip show setuptools

---
Metadata-Version: 2.0
Name: setuptools
Version: 28.7.0
Summary: Easily download, build, install, upgrade, and uninstall Python packages
Home-page: https://github.com/pypa/setuptools
Author: Python Packaging Authority
Author-email: distutils-sig@python.org
Installer: pip
License: UNKNOWN
Location: /home/ubuntu/env/lib/python2.7/site-packages
Requires: 
Classifiers:
  Development Status :: 5 - Production/Stable
  Intended Audience :: Developers
  License :: OSI Approved :: MIT License
  Operating System :: OS Independent
  Programming Language :: Python :: 2.6
  Programming Language :: Python :: 2.7
  Programming Language :: Python :: 3
  Programming Language :: Python :: 3.3
  Programming Language :: Python :: 3.4
  Programming Language :: Python :: 3.5
  Topic :: Software Development :: Libraries :: Python Modules
  Topic :: System :: Archiving :: Packaging
  Topic :: System :: Systems Administration
  Topic :: Utilities
Entry-points:
  [console_scripts]
  easy_install = setuptools.command.easy_install:main
  easy_install-3.5 = setuptools.command.easy_install:main
  [distutils.commands]
  alias = setuptools.command.alias:alias
  bdist_egg = setuptools.command.bdist_egg:bdist_egg
  bdist_rpm = setuptools.command.bdist_rpm:bdist_rpm
  bdist_wininst = setuptools.command.bdist_wininst:bdist_wininst
  build_ext = setuptools.command.build_ext:build_ext
  build_py = setuptools.command.build_py:build_py
  develop = setuptools.command.develop:develop
  easy_install = setuptools.command.easy_install:easy_install
  egg_info = setuptools.command.egg_info:egg_info
  install = setuptools.command.install:install
  install_egg_info = setuptools.command.install_egg_info:install_egg_info
  install_lib = setuptools.command.install_lib:install_lib
  install_scripts = setuptools.command.install_scripts:install_scripts
  register = setuptools.command.register:register
  rotate = setuptools.command.rotate:rotate
  saveopts = setuptools.command.saveopts:saveopts
  sdist = setuptools.command.sdist:sdist
  setopt = setuptools.command.setopt:setopt
  test = setuptools.command.test:test
  upload = setuptools.command.upload:upload
  upload_docs = setuptools.command.upload_docs:upload_docs
  [distutils.setup_keywords]
  convert_2to3_doctests = setuptools.dist:assert_string_list
  dependency_links = setuptools.dist:assert_string_list
  eager_resources = setuptools.dist:assert_string_list
  entry_points = setuptools.dist:check_entry_points
  exclude_package_data = setuptools.dist:check_package_data
  extras_require = setuptools.dist:check_extras
  include_package_data = setuptools.dist:assert_bool
  install_requires = setuptools.dist:check_requirements
  namespace_packages = setuptools.dist:check_nsp
  package_data = setuptools.dist:check_package_data
  packages = setuptools.dist:check_packages
  python_requires = setuptools.dist:check_specifier
  setup_requires = setuptools.dist:check_requirements
  test_loader = setuptools.dist:check_importable
  test_runner = setuptools.dist:check_importable
  test_suite = setuptools.dist:check_test_suite
  tests_require = setuptools.dist:check_requirements
  use_2to3 = setuptools.dist:assert_bool
  use_2to3_exclude_fixers = setuptools.dist:assert_string_list
  use_2to3_fixers = setuptools.dist:assert_string_list
  zip_safe = setuptools.dist:assert_bool
  [egg_info.writers]
  PKG-INFO = setuptools.command.egg_info:write_pkg_info
  dependency_links.txt = setuptools.command.egg_info:overwrite_arg
  depends.txt = setuptools.command.egg_info:warn_depends_obsolete
  eager_resources.txt = setuptools.command.egg_info:overwrite_arg
  entry_points.txt = setuptools.command.egg_info:write_entries
  namespace_packages.txt = setuptools.command.egg_info:overwrite_arg
  requires.txt = setuptools.command.egg_info:write_requirements
  top_level.txt = setuptools.command.egg_info:write_toplevel_names
  [setuptools.installation]
  eggsecutable = setuptools.command.easy_install:bootstrap