Fixing the underscore accesibility

Author: eduard13

lib/web/mage/utils/main.js

@@ -6,7 +6,10 @@ define(function (require) {
     'use strict';
 
     var utils = {},
-        _ = require('underscore');
+        _ = require('underscore'),
+        root = this || (0, eval)('this');
+
+    root._ = _;
 
     return _.extend(
         utils,