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

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

node_modules/underscore/cjs/isBoolean.js

@@ -0,0 +1,8 @@
+var _setup = require('./_setup.js');
+
+// Is a given value a boolean?
+function isBoolean(obj) {
+  return obj === true || obj === false || _setup.toString.call(obj) === '[object Boolean]';
+}
+
+module.exports = isBoolean;