ImportError for SNDArray
Building from the current master, I receive an ImportError from `__init__.py` related to `SNDArray` on import of Pandas. 

```
cannot import name SNDArray
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-d6ac987968b6> in <module>()
----> 1 import pandas

/Users/fonnescj/.virtualenvs/pymc2/lib/python2.7/site-packages/pandas-0.13.0_393_g1112cb7-py2.7-macosx-10.9-intel.egg/pandas/__init__.py in <module>()
      4 
      5 try:
----> 6     from . import hashtable, tslib, lib
      7 except Exception:  # pragma: no cover
      8     import sys

/Users/fonnescj/reduce.pyx in init pandas.lib (pandas/lib.c:53124)()

ImportError: cannot import name SNDArray
```

I'm running Python 2.7.5 on OS X 10.9.1, and build Pandas and the rest of the scientific stack pretty regularly. This is the first time this has come up. My build script is as follows:

```
rm -rf build dist
git pull
yes "" | make clean
make tseries
make sparse
python setup.py bdist_egg
easy_install -Z -N dist/*egg
```
