[gnome-shell] (3 commits) Non-fast-forward update to branch wip/rstrode/login-screen-extensions

[Ray Strode <halfline src gnome org>]

The branch 'wip/rstrode/login-screen-extensions' 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:

  5a3020c... extensionSystem: Allow extensions to run on the login scree
  b45ce71... sessionMode: Allow extensions at the login and unlock scree
  5c073e3... sessionMode: Drop allowExtensions property

Commits added to the branch:

  65b666b... extensionSystem: Allow extensions to run on the login scree
  766fd2b... sessionMode: Allow extensions at the login and unlock scree
  57c416d... sessionMode: Drop allowExtensions property