Setup.py should define setup_requires=
We have trouble combining pandas with <a href="http://buildout.org">buildout</a>. It looks like pandas depends on numpy during the setup phase, but it doesn't it declare the `setup_requires` (<a href="http://pythonhosted.org/distribute/setuptools.html">ref</a>) directive in setup.py. Any reason why this feature remains unused, or shall I submit a pull request? Because I see the matplotlib and numexpr don't use it as well.
