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

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

node_modules/underscore/amd/isNaN.js

@@ -0,0 +1,10 @@
+define(['./_setup', './isNumber'], function (_setup, isNumber) {
+
+  // Is the given value `NaN`?
+  function isNaN(obj) {
+    return isNumber(obj) && _setup._isNaN(obj);
+  }
+
+  return isNaN;
+
+});