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

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

node_modules/underscore/modules/iteratee.js

@@ -0,0 +1,10 @@
+import _ from './underscore.js';
+import baseIteratee from './_baseIteratee.js';
+
+// External wrapper for our callback generator. Users may customize
+// `_.iteratee` if they want additional predicate/iteratee shorthand styles.
+// This abstraction hides the internal-only `argCount` argument.
+export default function iteratee(value, context) {
+  return baseIteratee(value, context, Infinity);
+}
+_.iteratee = iteratee;