pip install fails with missing `setuptools.command` error

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I get the following stack trace trying to pip install or upgrate drfdocs, using Python 2.7, on both a mac running OS X 10.11.5 and a Ubuntu 14.04 machine.

```
[ubuntu@SEA] pip install --upgrade drfdocs
Downloading/unpacking drfdocs from https://pypi.python.org/packages/e5/9e/3a9aa6908ad7bd95b46f7fe05256681f4101de9a7769b6928159a986ef61/drfdocs-0.0.11.tar.gz#md5=ae42aba1e598ac110de74bdad0f3d3f4
Downloading drfdocs-0.0.11.tar.gz (771kB): 771kB downloaded
Running setup.py (path:/build/drfdocs/setup.py) egg_info for package drfdocs
Traceback (most recent call last):
File "", line 3, in
ImportError: No module named setuptools.command
Complete output from command python setup.py egg_info:
Traceback (most recent call last):

File "", line 3, in

ImportError: No module named setuptools.command

----------------------------------------
Cleaning up...
```

Both installs were done within virtualenvs with django1.9 installed. `pip` versions were 1.5.4 & 1.5.6

I didn't find this behavior with any other pip modules. Don't know if it's something DrfDocs is doing in its setup or some other setup-related issue.

Cheers!

Reproduce the failure with the Python 2.7 virtualenv setup described, using pip install --upgrade drfdocs. Start with setup.py and the python setup.py egg_info entry point shown in the traceback; done means the package installs or upgrades without the missing setuptools.command error.

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