Big-endians: test_value_counts_unique_nunique   AssertionError: False is not true
As here
http://nipy.bic.berkeley.edu/builders/pandas-py2.x-sid-sparc/builds/768/steps/shell_7/logs/stdio
on a sparc box (which I think some of you have access to) or on debian build boxes on powerpc and s390x:
https://buildd.debian.org/status/fetch.php?pkg=pandas&arch=powerpc&ver=0.14.0~rc1%2Bgit79-g1fa5dd4-1&stamp=1401244093

```
======================================================================
FAIL: test_value_counts_unique_nunique (pandas.tests.test_base.TestIndexOps)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildslave/nd-bb-slave-sparc-sid/pandas-py2_x-sid-sparc/build/venv/lib/python2.7/site-packages/pandas-0.14.0rc1_79_g1fa5dd4-py2.7-linux-sparc64.egg/pandas/tests/test_base.py", line 271, in test_value_counts_unique_nunique
    self.assertTrue(result[0] is pd.NaT)
AssertionError: False is not true
```
