add to makefile

node_modules/c9/object.js

@@ -0,0 +1,9 @@
+/*
+ * Swap keys and values of an object
+ */
+exports.invert = function(obj) {
+    return Object.keys(obj).reduce(function(res, key) {
+        res[obj[key]] = key;
+        return res;
+    }, {});
+};