title: `python -m ensurepip --upgrade` does not seem to be upgrading pip and setuptools
body: <p>I am on a Mac running Yosemite (Mac OS X 10.10.1) and <a href="http://brew.sh" rel="nofollow">homebrew</a> installed python and python3 and <code>python -m ensurepip --upgrade</code> does not seem to be working as I would have expected.</p>
  
  <p><code>python -m ensurepip --upgrade</code> does not upgrade pip or setuptools.</p>
  
  <p><code>pip install --upgrade pip setuptools</code> upgrades pip to 6.0.7 and upgrades setuptools to 12.0.5.</p>
  
  <p>Same results with Python3.  Do I misunderstand the purpose of <a href="https://docs.python.org/2.7/library/ensurepip.html" rel="nofollow">ensurepip</a>?</p>