Add a function for getting a list of files that have changed in the index
Add a function for getting a list of files that have changed in the index

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