Account for deprecated scipy simps function and numpy datatypes

[GregoryPetrochenkov-NOAA]

I went ahead and added an import for the new simpson function in the integrate model of scipy (formerly simps). In case the scipy version is old enough to have simps it will revert to that function. I also removed references to np.float_ and np.int_.

Changed

• reliability/Distributions.py: Added a try import from the newer integrate.simpson method, import integrate.simps if this fails
• reliability/Other_Functions.py: Removed data types that result in problems for updated version of numpy.

All unit tests passed locally as well with a default install of dependencies.