* room.memberAll() & change room.member() query to 3 types

* recover message.ts

* change alias to roomAlias

* recomver message.spec

* recover merge by mistake

* change roomAlias to alias based on semantic

* keep alias be simple and explicit roomAlias and contactAlias

1. in wxwebapp,first item in memberList is a random user from the room, 2. some times we can got owneruin or ChatRoomOwner . as those reason, first member from memberlist should not be  here any more (#358)

* #291 change throw error to return null

* add jsDoc

* #283

* add jsDoc

* load all memberList

* load memberlist

* allow memberList absence

* modify as request

* resign memberlist

* not change rawObj

* code clean