title: libedit/readline conflict with ipython 3.2.2 on OS X 10.7 Lion
body: <p>I've been trying to set up ipython 3 (running 2.7 works fine) on a mac running Lion, but can't seem to get rid of the following error:</p>
  
  <pre><code>192:~ mlauria$ /Library/Frameworks/Python.framework/Versions/3.2/bin/ipython3
  /Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/site-packages\
  /IPython/utils/rlineimpl.py:96: RuntimeWarning: Leopard libedit detected - \
  readline will not be well behaved including some crashes on tab completion, and \
  incorrect history navigation. It is highly recommended that you install readline,\
  which is easy_installable with: 'easy_install readline'
    RuntimeWarning)
  Python 3.2.2 (v3.2.2:137e45f15c0b, Sep  3 2011, 17:28:59)
  </code></pre>
  
  <p>easy_install readline worked correctly to fix this on ipython 2.7, but this doesn't fix 3.2.</p>