added whole system from ola4doc

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

@@ -0,0 +1,7 @@
+var buf = require('buffer');
+var Buffer = buf.Buffer;
+
+// could use Buffer.isBuffer but this is the same exact thing...
+module.exports = function(o) {
+  return typeof o === 'object' && o instanceof Buffer;
+};