 test_aggregate_item_by_item fails on SPARC py3
```
=============================================================
=========
FAIL: test_aggregate_item_by_item (pandas.tests.test_groupby.TestGroupBy)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildslave/nd-bb-slave-sparc-wheezy/pandas-py3_x-wheezy-sparc/build/venv/lib/python3.2/site-packages/pandas-0.13.0rc1_128_g375a66e-py3.2-linux-sparc64.egg/pandas/tests/test_groupby.py", line 556, in test_aggregate_item_by_item
    assert_almost_equal(result.xs('foo'), [foo] * K)
  File "testing.pyx", line 58, in pandas._testing.assert_almost_equal (pandas/src/testing.c:2554)
  File "testing.pyx", line 93, in pandas._testing.assert_almost_equal (pandas/src/testing.c:1796)
  File "testing.pyx", line 113, in pandas._testing.assert_almost_equal (pandas/src/testing.c:2077)
AssertionError: First object is numeric, second is not: 5.0 != 5
```

http://nipy.bic.berkeley.edu/builders/pandas-py3.x-wheezy-sparc
http://nipy.bic.berkeley.edu/builders/pandas-py3.x-wheezy-sparc/builds/330/steps/shell_4/logs/stdio

I've got a patch for a seperate unicode issue awaiting travis, with it and this fixed (cc @jreback), sparc should be green across the board.
