code: function(entity, x, y){
              var tile = this.map.get(x, y);
              return tile && !tile.blocksLos;
          }
docs: Checks if a map tile can be seen through.
  This is where code for special cases like smoke, fog, x-ray vision can be implemented by checking the entity param.
  @method entityCanSeeThrough
  @param {Number} x - The x map tile coord to check.
  @param {Number} y - The y map tile coord to check.
  @return {Bool}