[gnome-session] (11 commits) Non-fast-forward update to branch wip/muktupavels/flashback

[Alberts Muktupāvels <muktupavels src gnome org>]

The branch 'wip/muktupavels/flashback' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  2c6b761... don't use org.gnome.Shell for end session dialog

Commits added to the branch:

  3474df1... configure.ac: Add support for new versions of systemd (*)
  b150f64... Updated Greek translation (*)
  55ac864... Updated Swedish translation (*)
  b88aa0a... app: drop unused variable from state struct (*)
  fdaa1e7... app: changed registered from signal to property (*)
  51c36a1... manager: handle autorestart app death before registration (*)
  45d9ea3... NEWS: update for release (*)
  8e9dbe6... configure: bump to 3.15.90 (*)
  b472f84... Updated Galician translations (*)
  23a3153... Updated French translation (*)
  b8c8b9b... don't use org.gnome.Shell for end session dialog

(*) This commit already existed in another branch; no separate mail sent