0.1.1 update

this update includes basic improvements and critical bug fixes
of Light.Input.justPressed() and Light.Entity.getIntersect()

- use requestAnimationFrame instead of setTimeout

- add setters of width and height (automatically adjusts scale)

- add Light.Rectangle and Light.Entity.getBounds() for basic
  rectangle calculation

- add Light.TextField for wrapping context.fillText

- add preloader support (Light.Preloader, only Light.Sprite now)

- add Light.games for enables to make multiple game instance on one webpage
  (not tested)

- add pause() and resume() to Light.Game

- little bug fixes