dtype_from_element does identify all integers that need object dtype #50

>>> arraykit.dtype_from_element(-9223372036854775809)                                                                                                                                                                      
dtype('int64')
>>> np.array(-9223372036854775809, dtype=np.int64)                                                                                                                                                                         
---------------------------------------------------------------------------
OverflowError                             Traceback (most recent call last)
<ipython-input-7-64f1d1e93b0e> in <module>
----> 1 np.array(-9223372036854775809, dtype=np.int64)

OverflowError: Python int too large to convert to C long