fix a bug with numpy.shape() of the numpy v1.9

[RTsien]

np.shape([1,2,3]) 

it returns (3L,)

[strohel]

Hi, this breaks build with Cython and also totally breaks PyBayes with Python 2.x and Nupy different than 1.9. This must be solved differently.

[RTsien]

oh, sorry, i even hasnt considered cython.

I used the python ./setup.py --use-cython=no install, cause the pip install pybayes occured build error with cython.