add index to model/message
add index to model/message

pinclub/pinclub,zaiyu-dev/club,pinclub/pinclub,cnodejs/nodeclub,honger05/nodeclub,zaiyu-dev/club,Lottid/nodeclub,cnodejs/nodeclub,honger05/nodeclub,pinclub/pinclub,zaiyu-dev/club,Lottid/nodeclub,jayfans3/nodeclub,jayfans3/nodeclub