New in cocos 0.6.3
==================

  - support to load (some) .tmx maps with hexagonal tiles
  - compatibility break: HexMapLayer and HexCell changed __init__ signature
  - support collisions between CircleShape and AARectShape in collision_model, 
    thanks Daniel Gillet
  - support to read .tmx (Tiled Editor) object layers and objects
  - deprecated do_not_scale and do_not_scale_window, use autoscale
