Added the underscore node_module.

node_modules/underscore/amd/propertyOf.js

@@ -0,0 +1,13 @@
+define(['./noop', './get'], function (noop, get) {
+
+  // Generates a function for a given object that returns a given property.
+  function propertyOf(obj) {
+    if (obj == null) return noop;
+    return function(path) {
+      return get(obj, path);
+    };
+  }
+
+  return propertyOf;
+
+});