Bumping go and image

Exporting default neutral color

Importing image/jpeg, image/png to allow decoding images passed for d…

…ehydration

Adding a helper to dehydrate image and representative color

Using neutral gray as rep color when none is available

Tweaking rep colors some more improving cases broken with the last at…

…tempt

Tweaking rep colors to lower the min cap (allowing darker colors) and…

… add top cap (excluding colors closer to white)

Handling another potential invalid input

Handling invalid RepColor input

Tweaking ColorHEx function