expanding/zooming images toggles srstyle visibility
in lieu of handleSidebarHiding (7fa7f24847e888f0b1b31324a45487869ad6d143)

Small bug: window resizing should trigger .handleSRStyleToggleVisibility.  That should get fixed, but I'm being lazy about it right now.
Merge pull request #282 from andytuba/imagezoom-srstyletoggle

expanding/zooming images toggles srstyle visibility