title: unable to install matplotlib 1.3 - import fails due to dateutil
body: <p>On Ubuntu 12.04 Desktop I uninstalled matplotlib 1.1.1 and tried installing matplotlib 1.3 via pip install matplotlib.</p>
  
  <p>Everything seems to have worked but now when I try to import matplotlib I get the following:</p>
  
  <pre><code>Python 2.7.3 (default, Apr 10 2013, 06:20:15) 
  [GCC 4.6.3] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import matplotlib
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/home/radek/remedy_reports/local/lib/python2.7/site-packages/matplotlib/__init__.py", line 110, in &lt;module&gt;
      raise ImportError("matplotlib requires dateutil")
  ImportError: matplotlib requires dateutil
  </code></pre>
  
  <p>The problem is that when I do pip freeze I get:</p>
  
  <pre><code>Cython==0.19.1
  Jinja2==2.7
  MarkupSafe==0.18
  Pygments==1.6
  Sphinx==1.1.3
  argparse==1.2.1
  docutils==0.11
  ipython==1.0.0
  matplotlib==1.3.0
  nose==1.3.0
  numpy==1.7.1
  openpyxl==1.6.2
  pandas==0.12.0-274-gc472099
  pyodbc==3.0.7
  pyparsing==2.0.1
  python-dateutil==2.1
  pytz==2013b
  pyzmq==13.1.0
  scikit-learn==0.13.1
  scipy==0.12.0
  six==1.4.1
  tornado==3.1
  wsgiref==0.1.2
  </code></pre>
  
  <p>Dateutil is clearly there. If anyone share some light on why this is happening that would be greatly appreciated!</p>