Updates the preview swatches for texture nodes in the Hypershade.

Installation:

        Copy contents of the "script" directory to your scripts directory:

        You can check your scripts directory by typing "internalVar -usd;" in the command line.

Usage:

        Execute in ScriptEditor (in a MEL tab):

        source "rr_updateSwatches";

        rr_updateSwatches();

You can highlight those lines and middle click and drag it to your shelf to create a shelf icon.