Multi-Select with Shift+Click

[tpendragon]

If there's a bunch of files in a folder and you don't want to upload the entire folder.

[atz]

That would be default browser functionality if the elements were actually options in a HTML <select multiple>, but we have them as table-rows. We should try to use actual select/options.

Ideally, we should get away from the back-end delivering HTML partials altogether and start responding in JSON, leaving rendering to the AJAX layer. We might also employ some jquery filepicker/tree-traverser that has all the bells and whistles we want.