pandas error kills IPython kernel
Doing this simple thing can kill an IPython 2 notebook kernel (version:GH master):

``` python
url = 'http://nssdc.gsfc.nasa.gov/planetary/factsheet/index.html'
pd.read_table(url)
```

Note that I know this will fail, I just don't expect it to kill a notebook kernel?

Version:
pandas: 128ce857f1cd
IPython: 13facaf0206240a7301e045666143d68305d0119
