test_select_dtypes_not_an_attr_but_still_valid_dtype ValueError: 'timedelta64[ns]' is too specific of a frequency, try passing 'timedelta64'
0.14.0+git393-g959e3e4  building on not so recent ones (32bit builds are failing on that another one while testing for python2, so never see this one on python3)

```
======================================================================
ERROR: test_select_dtypes_not_an_attr_but_still_valid_dtype (pandas.tests.test_frame.TestDataFrame)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/buildd/pandas-0.14.0+git393-g959e3e4/debian/tmp/usr/lib/python3/dist-packages/pandas/tests/test_frame.py", line 13054, in test_select_dtypes_not_an_attr_but_still_valid_dtype
    r = df.select_dtypes(include=['i8', 'O', 'timedelta64[ns]'])
  File "/tmp/buildd/pandas-0.14.0+git393-g959e3e4/debian/tmp/usr/lib/python3/dist-packages/pandas/core/frame.py", line 1946, in select_dtypes
    selection)
  File "/tmp/buildd/pandas-0.14.0+git393-g959e3e4/debian/tmp/usr/lib/python3/dist-packages/pandas/core/frame.py", line 1945, in <lambda>
    frozenset(map(com._get_dtype_from_object, x)),
  File "/tmp/buildd/pandas-0.14.0+git393-g959e3e4/debian/tmp/usr/lib/python3/dist-packages/pandas/core/common.py", line 1650, in _get_dtype_from_object
    return _get_dtype_from_object(np.dtype(dtype))
  File "/tmp/buildd/pandas-0.14.0+git393-g959e3e4/debian/tmp/usr/lib/python3/dist-packages/pandas/core/common.py", line 1635, in _get_dtype_from_object
    _validate_date_like_dtype(dtype)
  File "/tmp/buildd/pandas-0.14.0+git393-g959e3e4/debian/tmp/usr/lib/python3/dist-packages/pandas/core/common.py", line 1613, in _validate_date_like_dtype
    % (dtype.name, dtype.type.__name__))
ValueError: 'timedelta64[ns]' is too specific of a frequency, try passing 'timedelta64'
```

```
pandas_0.14.0+git393-g959e3e4-1~nd12.04+1_amd64.build:ERROR: test_select_dtypes_not_an_attr_but_still_valid_dtype (pandas.tests.test_frame.TestDataFrame)
pandas_0.14.0+git393-g959e3e4-1~nd12.10+1_amd64.build:ERROR: test_select_dtypes_not_an_attr_but_still_valid_dtype (pandas.tests.test_frame.TestDataFrame)
pandas_0.14.0+git393-g959e3e4-1~nd70+1_amd64.build:ERROR: test_select_dtypes_not_an_attr_but_still_valid_dtype (pandas.tests.test_frame.TestDataFrame)
```

```
INSTALLED VERSIONS
------------------
commit: None
python: 3.2.3.final.0
python-bits: 64
OS: Linux
OS-release: 3.2.0-4-amd64
machine: x86_64
processor: 
byteorder: little
LC_ALL: C
LANG: C

pandas: 0.14.0.dev
nose: 1.1.2
Cython: None
numpy: 1.6.2
scipy: 0.10.1
statsmodels: None
IPython: None
sphinx: 1.1.3
patsy: None
scikits.timeseries: None
dateutil: 2.0
pytz: 2012c
bottleneck: None
tables: None
numexpr: None
matplotlib: None
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: 4.1.0
html5lib: None
httplib2: None
apiclient: None
rpy2: None
sqlalchemy: None
pymysql: None
psycopg2: None
```
