ERROR: Failure: ImportError (No module named pandas)
see: https://travis-ci.org/cancan101/pandas/jobs/12551987

```
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 not slow pandas --show-skipped
E
======================================================================
ERROR: Failure: ImportError (No module named pandas)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/virtualenv/python2.6_with_system_site_packages/lib/python2.6/site-packages/nose/loader.py", line 402, in loadTestsFromName
    module = resolve_name(addr.module)
  File "/home/travis/virtualenv/python2.6_with_system_site_packages/lib/python2.6/site-packages/nose/util.py", line 311, in resolve_name
    module = __import__('.'.join(parts_copy))
ImportError: No module named pandas
```
