Resolved issue with startGame being called twice. A new issue has arisen with the update method: it requires access to two contexts, the this that is the PongCore object and the this representing the object state that is passed into the update method.
Added 'silent' argument for command line execution of server.js. Adding this argument turns off all socket.io logs. Fixed bug with mouse data not being properly applied to paddles. Now in the process of restructuring to account for player number assignment.