anchor.diff:        object2.forEachAlive((item) {
   
           if (item.hitTestObject(object1)) {
  -          collisonHandler(object1, item);
  +          collisionHandler(object1, item);
           }
   
         });
  
positive.code: //=============================================================================
  
    /**
     * Resolve collison between two gameobject.
     * 
     * The input can be Group, Sprite or custome Sprite.
     * 
     * collisonHandler runs, when two object hits each other.
     * The two actual object in collison is the input parameters 
     * for the collisonHandler.
     * 
     * Example:
     *      player and enemy can be a Sprite or Group
  
negative.code: part of dartrocket.physics;
  
  /**
   * Physics class can solve collision between game object for now.
   * 
   * Example:
   *      //you can access the physics object this way
   *      game.physics
   */
  
  