title: Launching nose with --with-gae option raises ValueError for missing lib/ipaddr
body: <p>Setting up the testing framework and I can't seem to get past this error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/bin/nosetests", line 8, in &lt;module&gt;
      load_entry_point('nose==1.1.2', 'console_scripts', 'nosetests')()
    File "/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg/nose/core.py", line 118, in __init__
      **extra_args)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/main.py", line 94, in __init__
      self.parseArgs(argv)
    File "/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg/nose/core.py", line 135, in parseArgs
      self.config.configure(argv, doc=self.usage())
    File "/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg/nose/config.py", line 338, in configure
      self.plugins.configure(options, self)
    File "/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg/nose/plugins/manager.py", line 271, in configure
      cfg(options, config)
    File "/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg/nose/plugins/manager.py", line 94, in __call__
      return self.call(*arg, **kw)
    File "/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg/nose/plugins/manager.py", line 162, in simple
      result = meth(*arg, **kw)
    File "build/bdist.macosx-10.7-intel/egg/nosegae.py", line 80, in configure
    File "/usr/local/bin/dev_appserver.py", line 76, in &lt;module&gt;
      DIR_PATH = get_dir_path(os.path.join('lib', 'ipaddr'))
    File "/usr/local/bin/dev_appserver.py", line 66, in get_dir_path
      'file and %s.' % sibling)
  ValueError: Could not determine directory that contains both, this file and lib/ipaddr.
  </code></pre>
  
  <p>It's a correct error coming from <code>dev_appserver.py</code>... there is no <code>lib/ipaddr</code> in the <code>/usr/local/bin</code> directory.</p>
  
  <p>Why is <code>nosetests</code> triggering the raising of this error? Why does <code>dev_appengine</code> try to look for <code>lib/ipaddr</code> in the first place? </p>