Travis exception on LOCALE_OVERRIDE builds
https://travis-ci.org/pydata/pandas/jobs/15544827

```
$ ci/script.sh
inside ci/script.sh
Setting LC_ALL to zh_CN.GB18030
cannot import name hashtable

Traceback (most recent call last):
File "<string>", line 1, in <module>
File "pandas/__init__.py", line 9, in <module>
from . import hashtable, tslib, lib
ImportError: cannot import name hashtable
nosetests --exe -w /tmp -A slow and not network pandas --with-xunit --xunit-file=/tmp/nosetests.xml
............................S.......................S........................................................................................./home/travis/virtualenv/python2.7_with_system_site_packages/local/lib/python2.7/site-packages/pandas-0.13.0rc1_77_g7fd33e3-py2.7-linux-x86_64.egg/pandas/tools/plotting.py:1175: UserWarning: bw_method was added in Scipy 0.11.0. Scipy version in use is 0.10.0.
warnings.warn(msg)
........

----------------------------------------------------------------------
Ran 150 tests in 302.127s

OK (SKIP=2)
```

it should obviously be failing.
