feature request: different version of the image when zoomed

[tecunningham]

I love this extension, thank you, I use it for R visualizations.

It would be nice to be able to show the same visualization but render it with a different figure-size when in the lightbox. E.g. fig-width=2 when small, fig-width=5 when zoomed. As far as I understand this isn't possible right now, but the GLightbox package does include the functionality to show a different image when zoomed.