[LightDM] lightdm 1.1.3

[Robert Ancell]

Overview of changes in lightdm 1.1.3

    * Actually return the system default keyboard layout, not just 'us'
    * Add keyboard layout variants to list of keyboard layouts
    * Check accountsservice as well as .dmrc for users' layouts
    * Add lightdm_user_get_layouts() to query the configured list of layouts
      on a per-user basis
    * Add Lock D-Bus method that locks the seat and provides a hint to the
      greeter to be in lock mode.
    * Automatically lock sessions when switching away from them
    * Add a has-messages property to liblightdm
    * Add regression tests for PAM modules changing usernames
    * Don't use g_key_file_unref, it requires glib 2.32