- Update version to 1.28.0
* Translations update
* Revert "gsm-manager: use g_settings_schema_source_lookup ()"
* Add system desktop files item to automatic startup support
* main: fix double free on gl_renderer
* g_key_file_save_to_file () is available from glib 2.40
* gsm-manager: use g_settings_schema_source_lookup ()
* gsm-inhibit-dialog: Fix -Wimplicit-int-float-conversion warnings
* Fix build warnings about missing field initializer
* Fix implicit conversion changes signedness: 'gboolean' to 'guint'
* mate-session: fix memory leak
* configure.ac: The macro 'AC_HELP_STRING' is obsolete