Remove custom "extend" method.

Replace with NPM extend.

src/core/fresh-resume.js

@@ -11,7 +11,7 @@ Definition of the FRESHResume class.
 
 
   var FS = require('fs')
-    , extend = require('../utils/extend')
+    , extend = require('extend')
     , validator = require('is-my-json-valid')
     , _ = require('underscore')
     , __ = require('lodash')

src/core/fresh-theme.js

@@ -9,13 +9,12 @@ Definition of the FRESHTheme class.
 
 
   var FS = require('fs')
-    , extend = require('../utils/extend')
     , validator = require('is-my-json-valid')
     , _ = require('underscore')
     , PATH = require('path')
     , parsePath = require('parse-filepath')
     , pathExists = require('path-exists').sync
-    , EXTEND = require('../utils/extend')
+    , EXTEND = require('extend')
     , moment = require('moment')
     , READFILES = require('recursive-readdir-sync');
 

src/core/jrs-resume.js

@@ -11,7 +11,7 @@ Definition of the JRSResume class.
 
 
   var FS = require('fs')
-    , extend = require('../utils/extend')
+    , extend = require('extend')
     , validator = require('is-my-json-valid')
     , _ = require('underscore')
     , PATH = require('path')