attachImageDiff now handles committed images as well
attachImageDiff now handles committed images as well

Fixes #646

gengjiawen/desktop,desktop/desktop,say25/desktop,artivilla/desktop,shiftkey/desktop,j-f1/forked-desktop,desktop/desktop,say25/desktop,hjobrien/desktop,kactus-io/kactus,BugTesterTest/desktops,hjobrien/desktop,say25/desktop,shiftkey/desktop,j-f1/forked-desktop,BugTesterTest/desktops,gengjiawen/desktop,kactus-io/kactus,BugTesterTest/desktops,BugTesterTest/desktops,gengjiawen/desktop,artivilla/desktop,artivilla/desktop,kactus-io/kactus,j-f1/forked-desktop,j-f1/forked-desktop,hjobrien/desktop,desktop/desktop,say25/desktop,gengjiawen/desktop,kactus-io/kactus,artivilla/desktop,shiftkey/desktop,hjobrien/desktop,desktop/desktop,shiftkey/desktop