Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/underscore/cjs/extendOwn.js

@@ -0,0 +1,9 @@
+var _createAssigner = require('./_createAssigner.js');
+var keys = require('./keys.js');
+
+// Assigns a given object with all the own properties in the passed-in
+// object(s).
+// (https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
+var extendOwn = _createAssigner(keys);
+
+module.exports = extendOwn;