Version 0.0.1b released.

* New: Hero will collide with world bounds now.
* New: Added hero's animation support.
* New: Collide with tiles.
* New: Slowing the animation speed while colliding with tiles and world
bounds.
* New: Added constants.js to manage unchangeable codes.

* Updated: Changed the look of the stair in hero's house.

* Fixed: Removed collidable layer of hero's house in Tiled.