[gnome-session] (3 commits) Non-fast-forward update to branch wip/laney/systemd-user

[Iain Lane <iainl src gnome org>]

The branch 'wip/laney/systemd-user' 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:

  b0aa483... Start GNOME session with systemd
  82c538e... Add GNOME_SESSION_AUTOSTART_DIR variable to set the autosta
  48babb6... Call it gnome-session.target
  854982b... Add a gnome-session-systemd binary to launch the session

Commits added to the branch:

  c66da1d... Start GNOME session with systemd
  4240886... Add GNOME_SESSION_AUTOSTART_DIR variable to set the autosta
  a2bbb17... Add a gnome-session-systemd binary to launch the session