Added the underscore node_module.

node_modules/underscore/modules/pluck.js

@@ -0,0 +1,7 @@
+import map from './map.js';
+import property from './property.js';
+
+// Convenience version of a common use case of `_.map`: fetching a property.
+export default function pluck(obj, key) {
+  return map(obj, property(key));
+}