remove commented old zlib code

lib/mbtiles.js

@@ -215,25 +215,6 @@ MBTiles.prototype.getGrid = function(z, x, y, callback) {
             }
             if (err) return callback(err);
 
-            /*
-            try {
-                var grid = zlib.inflate(
-                           !Buffer.isBuffer(row.grid)
-                           ? new Buffer(row.grid, 'binary')
-                           : row.grid
-                       ).toString();
-                var data = rows.reduce(function(memo, r) {
-                        memo[r.key_name] = JSON.parse(r.key_json);
-                        return memo;
-                    }, {});
-                var result = _(JSON.parse(grid)).extend({ data: data });
-            } catch (err) {
-                return callback(new Error('Grid is invalid:' + err.message));
-            }
-
-            callback(null, result);
-            */
-
             zlib.inflate(!Buffer.isBuffer(row.grid)
                            ? new Buffer(row.grid, 'binary')
                            : row.grid
@@ -584,10 +565,6 @@ MBTiles.prototype.putGrid = function(z, x, y, data, callback) {
     var id = crypto.createHash('md5').update(json).digest('hex');
     if (!this._gridCache[id]) {
         // This corresponds to the grid_utfgrid table.
-
-        /*
-        this._gridCache[id] = zlib.deflate(new Buffer(json, 'utf8'));
-        */
         var that = this;
         Step(function() {
             zlib.deflate(new Buffer(json, 'utf8'),this);