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

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

node_modules/underscore/modules/negate.js

@@ -0,0 +1,6 @@
+// Returns a negated version of the passed-in predicate.
+export default function negate(predicate) {
+  return function() {
+    return !predicate.apply(this, arguments);
+  };
+}