Mutated type in Quantity

If I do a `np.shape` over a Quantity, the operation mutates the type of the `.magnitude`

See the example below :

``` 
#pint.__version__  ('0.8')
#numpy.__version__ ('1.10.1')

import pint
import numpy as np

ureg = pint.UnitRegistry()
q = ureg.Quantity(1)
print type(q.magnitude) # <type 'int'>
np.shape(q) #Out[6]: ()
print type(q.magnitude) # <type 'numpy.ndarray'>
```