Add lodash dependency to lib/elevate.coffee

Depedency was missing and thus elevating functions threw errors.

build/elevate.js

@@ -1,5 +1,7 @@
 (function() {
-  var isWindows, os, path;
+  var _, isWindows, os, path;
+
+  _ = require('lodash');
 
   os = require('os');
 

lib/elevate.coffee

@@ -1,3 +1,4 @@
+_ = require('lodash')
 os = require('os')
 path = require('path')