[Numpy-discussion] histogram gives meaningless results with non-finite range

[Luke Zoltan Kelley]

This came up in [a matplotlib issue](https://github.com/matplotlib/matplotlib/issues/5221):

>>> np.histogram(np.arange(10), range=(0.0, np.inf))
(array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0]),
 array([ nan,  inf,  inf,  inf,  inf,  inf,  inf,  inf,  inf,  inf,  inf]))

>>> np.histogram(np.arange(10), range=(0.0, np.nan))
(array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0]),
 array([ nan,  nan,  nan,  nan,  nan,  nan,  nan,  nan,  nan,  nan,  nan]))

Clearly the behavior is undefined for those arguments, but perhaps there should be an assertion that the given range must be finite?  Happy to make a PR for this.

Luke
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