Get rid of Gtk-WARNING **: Unknown property: GtkHBox.expand
Merge pull request #61 from monsta/patch-1

Get rid of Gtk-WARNING **: Unknown property: GtkHBox.expand
Set XDG_CURRENT_DESKTOP if unset

XDG_CURRENT_DESKTOP is used by glib >= 2.42 at g_desktop_app_info* functions
Merge branch 'xdg_current_desktop'