Fix bug in Gnome3.16
Fix bug in Gnome3.16

Add version switch for actionMode

Thanks to @sarhugo

https://github.com/OttoAllmendinger/gnome-shell-imgur/issues/23#issuecomment-91559383

Ugzuzg/gnome-shell-imgur,OttoAllmendinger/gnome-shell-imgur,madflow/gnome-shell-imgur