IHaskellDisplay instances for the image types of the JuicyPixels package

Here are the instances for the image types of the JuicyPixels package together with a small example notebook.

Please feel free to request changes, if you don't like something, or to reject the whole PR.

Note: I'm NOT the author/maintainer of JuicyPixels. I'm just a user of this package and would like to use these images in my IHaskell notebooks.