Added JBox2D, Camera, Tutorial Debug Draw

+ JBox2D jar file added, imported
+ Camera replaced the conversion class
+ Tutorial now has a debug draw function (still in works), start by
pressing Q
+ JBox2d world added in tutorial with a ground, player and circle
+ DebugDrawJ2D class added to draw pure physics overtop of game in debug
mode
~ Escape button now goes back to main menu instead of quiting