Add methods to Member for returning result arrays

[connorferster]

Add methods to Member for returning result arrays

[JWock82]

I like this idea. I think there's a way to do it with minimal extra lines of code. What if we had a boolean argument in the plot_shear method named 'to_array' (defaults to False) that changed the output of the method to an array instead of a matplotlib plot? I agree that 20 points is often just not enough too. I've been meaning to add an 'n' argument to plot_shear as well.

[JWock82]

It seems like all it would take is an if statement placed conveniently to ignore the plotting commands and return the array directly.