PyArray_FROM_OTF and PyArray_FROM_OT should return type `object`

They were declared as returning type `bint`, but this appears to be incorrect.

http://docs.scipy.org/doc/numpy/reference/c-api.array.html#PyArray_FROM_OTF

http://docs.scipy.org/doc/numpy/reference/c-api.array.html#PyArray_FROM_OT