[LightDM] Version 1.0.8 released

[Robert Ancell]

This release contains an important security fix for daemon file
descriptors being leaked to the session process.  All users should
immediately upgrade.

Overview of changes in lightdm 1.0.8

    * Stop file descriptors leaking into the session processes
    * Change session directory once user permissions are set so it works
      on NFS filesystems that don't allow root to access files.
    * Fix liblightdm-qt-1.pc linking against the wrong libraries
    * Fix introspection bindings not containing any methods
    * Fix object cleanup on exit
    * Fix compilation against gthread
    * Fix lightdm --debug not working on newer GLib