Clamp viewport position when resizing the bounds
Clamp viewport position when resizing the bounds

- See platformer2 for an example of this bug after the map1->map2 transition

srbala/melonJS,rlugojr/melonJS,melonjs/melonJS,srbala/melonJS,rlugojr/melonJS,rlugojr/melonJS,srbala/melonJS,melonjs/melonJS