code: function(x, y, value) {
              if (x < 0 || x >= this.width || y < 0 || y >= this.height) {
                  return;
              }
              this.data[x][y] = value;
          }
docs: Sets a value at given coords.
  @method set
  @param {Number} x - Map tile x coord of the value being set.
  @param {Number} y - Map tile y coord of the value being set.
  @param {Mixed} value - The value being set at given coords.