Reverted native functions to lodash as discussed in PR #54

Author: analog-nico

lib/rp.js

@@ -3,9 +3,12 @@
 var Bluebird = require('./bluebird-fresh.js'),
     CapturedTrace = require('./bluebird-captured-trace-fresh.js'),
     assign = require('lodash/object/assign'),
+    forEach = require('lodash/collection/forEach'),
     isFunction = require('lodash/lang/isFunction'),
     isPlainObject = require('lodash/lang/isPlainObject'),
     isString = require('lodash/lang/isString'),
+    isUndefined = require('lodash/lang/isUndefined'),
+    keys = require('lodash/object/keys'),
     chalk = require('chalk'),
     errors = require('./errors.js');
 
@@ -14,7 +17,7 @@ var Bluebird = require('./bluebird-fresh.js'),
 var request = (function () {
 
     function clearCache() {
-        Object.keys(require.cache).forEach(function (key) {
+        forEach(keys(require.cache), function (key) {
             delete require.cache[key];
         });
     }
@@ -131,7 +134,7 @@ function expose(methodToExpose, exposeAs) {
     exposeAs = exposeAs || methodToExpose;
 
     /* istanbul ignore if */
-    if (request.Request.prototype[exposeAs] !== undefined) {
+    if (!isUndefined(request.Request.prototype[exposeAs])) {
         console.error(chalk.bold.bgRed('[Request-Promise] Unable to expose method "' + exposeAs + '". It is already implemented by Request. Please visit https://github.com/request/request-promise/wiki/Troubleshooting'));
         return;
     }