nosetests fails one test
Hi Wes, 

I have just watched your 3+ hour talk on pandas and got enthusiastic.  So, I am exploring pandas for my scientific work on high-frequency finance data.  Thanks for all the good stuff. 

There is one issue you might want to know about.  This morning I upgraded to the latest Enthought python distribution and then tried to install pandas as indicated in your manual.  But, trying separately on two machines, I keep getting the following failure (see below).  It seems so far to go unreported so I thought I should let you know about it (I tried it on a MB Air and a Mac Pro which both have Mac OS Lion installed (and I always run Mac software upgrades)). 

Keep up the good work!  Greetings from Amsterdam.

Cheers, Albert
## FAIL: test_timeseries_preepoch (pandas.io.tests.test_pytables.TesttHDFStore)

Traceback (most recent call last):
  File "/Users/albertjmenkveld/Downloads/pandas/pandas/io/tests/test_pytables.py", line 216, in test_timeseries_preepoch
    self._check_roundtrip(ts, tm.assert_series_equal)
  File "/Users/albertjmenkveld/Downloads/pandas/pandas/io/tests/test_pytables.py", line 459, in _check_roundtrip
    comparator(retrieved, obj)
  File "/Users/albertjmenkveld/Downloads/pandas/pandas/util/testing.py", line 124, in assert_series_equal
    assert(left.index.equals(right.index))
AssertionError
