Bump to v4.0.0.

noop.js

@@ -0,0 +1,22 @@
+define([], function() {
+
+  /**
+   * A no-operation function that returns `undefined` regardless of the
+   * arguments it receives.
+   *
+   * @static
+   * @memberOf _
+   * @category Util
+   * @example
+   *
+   * var object = { 'user': 'fred' };
+   *
+   * _.noop(object) === undefined;
+   * // => true
+   */
+  function noop() {
+    // No operation performed.
+  }
+
+  return noop;
+});