pytz/dateutil and matplotlib
I just installed the python stack on a new system and replicated a problem I see often. I assume it comes from the fact that dateutil and pytz are installed by matplotlib and then pandas adds them to easy-install.pth because of the install_requires in setup.py. I see this message every time I start the interpreter due to my default imports. This gets quite old. Do others see this. Should I be doing something else? So far I just go in and delete the entries that pandas puts in easy-install.pth.

```
/usr/local/lib/python2.7/dist-packages/pytz/__init__.py:35: UserWarning: Module pytz was already imported from /usr/local/lib/python2.7/dist-packages/pytz/__init__.pyc, but /usr/local/lib/python2.7/dist-packages/pytz-2012h-py2.7.egg is being added to sys.path
  from pkg_resources import resource_stream
/usr/local/lib/python2.7/dist-packages/pytz/__init__.py:35: UserWarning: Module dateutil was already imported from /usr/local/lib/python2.7/dist-packages/dateutil/__init__.pyc, but /usr/local/lib/python2.7/dist-packages/python_dateutil-2.1-py2.7.egg is being added to sys.path
  from pkg_resources import resource_stream
```
