Merge guest session lockdown

diff --cc NEWS
index e5c9dd54c8b13eb9ae37e62c18fe8d6c9bf110c2,d3db81f1bf00be37db0f5104fb8aa718c3bab2bc..3574e433da72b54d6ff3ea48c0f72a943da4efec
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -16,7 -16,10 +16,11 @@@ Overview of changes in lightdm 1.1.
      * Start authentication when scrolling through GTK greeter entries
      * Link liblightdm-qt against QtGui
      * Fix liblightdm-qt crashing when face images are installed
 +    * Set correct permissions on session log files
+     * Introduce a lightdm-guest-session-wrapper session command which MAC
+       systems like AppArmor and SELinux can use for attaching a restrictive
+       policy to guest sessions.
+     * Provide an AppArmor profile for guest session lockdown.
  
  Overview of changes in lightdm 1.0.0