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

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

node_modules/underscore/cjs/_keyInObj.js

@@ -0,0 +1,7 @@
+// Internal `_.pick` helper function to determine whether `key` is an enumerable
+// property name of `obj`.
+function keyInObj(value, key, obj) {
+  return key in obj;
+}
+
+module.exports = keyInObj;