Add ClientHandler and ClientHandlerTest classes
Add handler's methods
Merge branch 'master' into create-client-handler-class
Implement unit tests onConnect and onGetRoom
Add test onConnect_user_has_device_info
Merge branch 'master' into create-client-handler-class
Add onMessageBegin test and Add clientHandlers map to Beeper
Merge branch 'create-client-handler-class'