Fix import problem

This should fix the import problem. However, I'm getting the following error.

```
>>> import pyqpbo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/fgregg/lib64/python2.6/site-packages/pyqpbo/__init__.py", line 1, in <module>
    from pyqpbo import *
ImportError: /home/fgregg/lib64/python2.6/site-packages/pyqpbo/pyqpbo.so: undefined symbol: _ZN4QPBOIiED1Ev
```