Added the underscore node_module.

node_modules/underscore/cjs/pluck.js

@@ -0,0 +1,9 @@
+var map = require('./map.js');
+var property = require('./property.js');
+
+// Convenience version of a common use case of `_.map`: fetching a property.
+function pluck(obj, key) {
+  return map(obj, property(key));
+}
+
+module.exports = pluck;