Revert "Commit updated Javascript packages"

This reverts commit a88734348a.

build/javascript/node_modules/lodash/_baseMean.js

@@ -1,20 +0,0 @@
-var baseSum = require('./_baseSum');
-
-/** Used as references for various `Number` constants. */
-var NAN = 0 / 0;
-
-/**
- * The base implementation of `_.mean` and `_.meanBy` without support for
- * iteratee shorthands.
- *
- * @private
- * @param {Array} array The array to iterate over.
- * @param {Function} iteratee The function invoked per iteration.
- * @returns {number} Returns the mean.
- */
-function baseMean(array, iteratee) {
-  var length = array == null ? 0 : array.length;
-  return length ? (baseSum(array, iteratee) / length) : NAN;
-}
-
-module.exports = baseMean;