Tablet / phone support

[mmp]

As far as I can tell, most of Jeri's functionality isn't available on touch-screen devices (other than switching between images by tapping on the selector at the top.) It doesn't seem to be possible to pan or zoom the image, for example; those events seem to just apply to the entire webpage, even if I tap on a jeri-rendered image.

It would be great if more of that functionality was available on touch-screen devices.