mv message api from offsetlimit to lastid
show is friend in greeting list
change greetings order
add read_at for message
add last_read table
add unread related api
mv debug code to function
rm user_id for lastid api
update readme for last_read api
test cron
考虑在last_read表中没有当前用户记录的情况
cron test
cron test
add cron test for fetch movies from douban
test cron with redirect stderr