install gulp to process code

node_modules/vinyl-fs/lib/src/wrap-vinyl.js

@@ -0,0 +1,18 @@
+'use strict';
+
+var File = require('vinyl');
+var Transform = require('streamx').Transform;
+
+function wrapVinyl() {
+  function wrapFile(globFile, callback) {
+    var file = new File(globFile);
+
+    callback(null, file);
+  }
+
+  return new Transform({
+    transform: wrapFile,
+  });
+}
+
+module.exports = wrapVinyl;