DB defaults update, friend and group state cleanup.

CHANGELOG.md

api/api.pb.go

api/api.proto

apigrpc/apigrpc.pb.go

apigrpc/apigrpc.swagger.json

migrate/sql/20180103142001_initial_schema.sql

server/config.go

server/core_authenticate.go

server/core_friend.go

server/core_group.go

server/runtime_go_nakama.go

server/runtime_lua.go

server/runtime_lua_match_core.go

server/runtime_lua_nakama.go