[SciPy-Dev] factorial2 does not return a float with exact=False

[Vincent Davis]

According to the docs factorial2 should return a float or int, float
in the case of exact=False, It does not.

>>> import scipy.misc.common as sc
>>> sc.factorial2(7, exact=False)
array(105.00000000000001)
>>> sc.factorial2(7, exact=True)
105L
>>> sc.factorial2(8, exact=True)
384L
>>> sc.factorial2(8, exact=False)
array(384.0)
>>> sc.factorial2(8, exact=False)