added whole system from ola4doc

sys/node_modules/gulp-util/lib/buffer.js

@@ -0,0 +1,15 @@
+var through = require('through2');
+
+module.exports = function(fn) {
+  var buf = [];
+  var end = function(cb) {
+    this.push(buf);
+    cb();
+    if(fn) fn(null, buf);
+  };
+  var push = function(data, enc, cb) {
+    buf.push(data);
+    cb();
+  };
+  return through.obj(push, end);
+};