[LightDM] lightdm 1.4.0 released

[Robert Ancell]

This is the first release in the stable 1.4 series. This series will
be maintained on the lp:lightdm/1.4 branch and trunk (lp:lightdm) will
now be used for the unstable 1.5 series.

Overview of changes in lightdm 1.4.0

    * Correctly implement and test autologin timeouts
    * Add greeter-show-remote-login hint
    * Correctly annotate enums in vapi file
    * QLightDM: Add default constructor to Qt power interface
    * QLightDM: Expose image path in UserModel
    * QLightDM: Add parameter to session model to show either local or remote
      sessions
    * Fix race conditions in tests

https://launchpad.net/lightdm/+download