app/greeter:update guest-->Guest
acounts.coffee:add guest_id guest_name guest_icon
lock:add is_guest()
lock:new_userinfo_for_lock: if is_guest then ... else ....
update po
greeter:恢复成不手动在accounts.coffee中创建 guest_id guest_name 的时候
Merge remote-tracking branch 'origin/master' into develop