title: run Cython python setup.py build_ext --inplace, cs231n
body: <p>I am follow the standard <strong>cs231n</strong>, in the assignment2, when I run 
   python <code>setup.py</code> <code>build_ext --inplace</code>, on my <strong>Mac os x</strong> capitan, it always gives me back '<code>running build_txt</code>', and I think this is based on <strong>Cython</strong>, but It seems that this command doesn't work, i checked out that Ive gcc, so do you guys have any idea about this? here is the 
  <a href="http://cs231n.github.io/assignments2016/assignment2/" rel="nofollow">tutorial</a>.</p>
  
  <p>It works for my Ubuntu, but doesn't work on my Mac, I am not familiar with C, and Cython neither.
  Any suggestion will be appreciated.</p>