todo.txt

    -fix rotation (do conversion on processing canvas)

    -test and add tap event

    -container object?

    -retina displays suppor (sprites)

    -click on primitives or sprite: add z-index options for all layers

    -sprite effects for game loop:
        fadeOut(frames, callback);
        fadeIn
        turn(angle, frames, callback) or -angle
        moveTo(x, y, frames, callback)
        moveLeft moveRight moveUp moveBottom

        maybe also make it chainable: moveTo().fadeOut().fadeIn()

        _isBusy === true when animate or moving
        .stop() to stop moving or animate

        also, add angle property to all objects

    -move collision check to scene's method, improve collision check:
        plant.isCollision(obj, obj)
        plant.isCollision(ArrayOfObj, obj) ??
        plant.isCollision(obj, ArrayOfObj)
        plant.isCollision(ArrayOfObj, ArrayOfObj)


    -keybinder:
        var myKeybinder = new plant.Keybinder();
        myKeybinder['A'].keyDown(function(){
          myPlayer.jump();
        });

        OR
        myKeybinder['Space'].keyDown = function(){
          myPlayer.jump();
        });