Support old-Node Buffer ctor

Author: cjbarth

tasks/taggers/hash.js

@@ -21,7 +21,7 @@ module.exports = function (src, options) {
 
   src.forEach(function (f) {
     var input = fs.openSync(f, 'r');
-    var chunk = Buffer.alloc(256);
+    var chunk = Buffer.alloc ? Buffer.alloc(256) : (new Buffer(256)).fill(0);
     var offset;
     while (0 !== (offset = fs.readSync(input, chunk, 0, 256))) {
       hash.update(chunk);