* Update Greybrid to latest tag (v1.0), including:
  - indicator-messages icon downscaled. lp: #1041893
  - fix lightdm-gtk-greeter theming and drop broken Greybird-lightdm
    variant.
  - slight tweaks for a more unified appearance with both gtk2 and gtk3
    themes.
* debian/patches:
  - 01_fix-grey-bg-on-button-labels-when-pressed.patch: dropped, applied
    upstream.
* debian/shimmer-themes.links, debian/shimmer-themes.install: drop Greybird-
  lightdm workaround.