Use node's require instead of internal require

benchmark/benchmark-helper.coffee

@@ -1,6 +1,6 @@
 nakedLoad 'jasmine-jquery'
 $ = require 'jquery'
-_ = nodeRequire 'underscore'
+_ = require 'underscore'
 Keymap = require 'keymap'
 Point = require 'point'
 Config = require 'config'

benchmark/benchmark-suite.coffee

@@ -1,7 +1,7 @@
 require 'benchmark-helper'
-fs = require 'fs'
+fs = require 'fs-utils'
 $ = require 'jquery'
-_ = nodeRequire 'underscore'
+_ = require 'underscore'
 TokenizedBuffer = require 'tokenized-buffer'
 
 describe "editor.", ->

benchmark/fixtures/medium.coffee

@@ -145,7 +145,7 @@ generate_html = (source, sections) ->
 
 # Require our external dependencies, including **Showdown.js**
 # (the JavaScript implementation of Markdown).
-fs       = require 'fs'
+fs       = require 'fs-utils'
 path     = require 'path'
 showdown = require('./../vendor/showdown').Showdown
 {spawn, exec} = require 'child_process'