Add missing Underscore require().

src/eng/handlebars-generator.js

@@ -11,7 +11,6 @@ Definition of the HandlebarsGenerator class.
   var _ = require('underscore')
     , HANDLEBARS = require('handlebars')
     , FS = require('fs')
-    , _ = require('underscore')
     , registerHelpers = require('./handlebars-helpers');
 
 

src/eng/handlebars-helpers.js

@@ -10,7 +10,8 @@ Template helper definitions for Handlebars.
   var HANDLEBARS = require('handlebars')
   , MD = require('marked')
   , H2W = require('../utils/html-to-wpml')
-  , moment = require('moment');
+  , moment = require('moment')
+  , _ = require('underscore');
 
   /**
   Register useful Handlebars helpers.