code: function hasTile(tiles, tile) {
      for (var i = 0; i < tiles.length; i++) {
          if (tilesEqual(tiles[i], tile)) return true;
      }
      return false;
  }
docs: Check to see if an array of tiles contains a particular tile
  
  @name hasTile
  @param {Array<Array<number>>} tiles
  @param {Array<number>} tile
  @returns {boolean}
  @example
  var tiles = [
  [0, 0, 5],
  [0, 1, 5],
  [1, 1, 5],
  [1, 0, 5]
  ]
  hasTile(tiles, [0, 0, 5])
  //=boolean