Removing all jquery dependencies

all code is written in pure java script
Merge branch 'client-refactoring' of github.com:pantuza/node-pong into client-refactoring
Client Refactoring

Created name space for each client side part:

    . canvas.js - Controls all canvas
    . connection.js - Controls the communication to the server
    . game.js - Controls the game flow
    . client.js - Controls the page and all scripts execution

Established public and private methods/attributes for name spaces
Refactored methods, name definitions and callbacks on name spaces