unable to install python-daemon==2.0.5 with setup.py develop

[Michael Placentra II]

Having the same issue with 2.0.6:

Processing dependencies for luigi-swf==0.14.1
Searching for python-daemon==2.0.6
Reading https://pypi.python.org/simple/python-daemon/
Best match: python-daemon 2.0.6
Downloading
https://pypi.python.org/packages/source/p/python-daemon/python-daemon-2.0.6.tar.gz#md5=049508c47c8fa054e91ec9a3c572f939
Processing python-daemon-2.0.6.tar.gz
Writing /tmp/easy_install-vlBAEm/python-daemon-2.0.6/setup.cfg
Running python-daemon-2.0.6/setup.py -q bdist_egg --dist-dir
/tmp/easy_install-vlBAEm/python-daemon-2.0.6/egg-dist-tmp-FVo0Gd
/home/docs/checkouts/
readthedocs.org/user_builds/luigi-swf/envs/fix-daemon-install/local/lib/python2.7/site-packages/setuptools/dist.py:294:
UserWarning: The version specified (u'UNKNOWN') is an invalid version, this
may not work as expected with newer versions of setuptools, pip, and PyPI.
Please see PEP 440 for more details.
  "details." % self.metadata.version
creating /home/docs/checkouts/
readthedocs.org/user_builds/luigi-swf/envs/fix-daemon-install/lib/python2.7/site-packages/python_daemon-UNKNOWN-py2.7.egg
Extracting python_daemon-UNKNOWN-py2.7.egg to /home/docs/checkouts/
readthedocs.org/user_builds/luigi-swf/envs/fix-daemon-install/lib/python2.7/site-packages
Adding python-daemon UNKNOWN to easy-install.pth file

Installed /home/docs/checkouts/
readthedocs.org/user_builds/luigi-swf/envs/fix-daemon-install/lib/python2.7/site-packages/python_daemon-UNKNOWN-py2.7.egg
error: The 'python-daemon==2.0.6' distribution was not found and is
required by luigi-swf


It's happening in the readthedocs.org system which is trying to build the
documentation for our open source package (luigi-swf).

-Mike
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