unnecessary emacs vc-revert patch, kept only for posterity
updated to version 0.21 for new gmail build
add missing dates to changelog
version 0.22:
 - re-hide sandbar (top right header)
 - fix search box z-index to put it behind pop-up menus; also add left margin
 - fix settings gear button so that it always shows. let me know if you don't
   like this, i'm open to reverting it.