Typescript transition step 6: fix room.ts & tslint
Typescript transition step 6: fix room.ts & tslint

lijiarui/wechaty,Chatie/wechaty,binsee/wechaty,wechaty/wechaty,wechaty/wechaty,lijiarui/wechaty,Chatie/wechaty,mukaiu/wechaty,binsee/wechaty,mukaiu/wechaty,Chatie/wechaty,wechaty/wechaty,zixia/wechaty,mukaiu/wechaty,binsee/wechaty,zixia/wechaty