[facebbook]graph api remove offline access token

[facebbook]graph api remove offline access token

移除了offline_accessc後，除了開始的兩個小時外，還可以另外延長到60天。

fbconsole/README.md at master · facebook/fbconsole
https://github.com/facebook/fbconsole/blob/master/README.md
Removal of offline_access permission - Facebook 開發人員
http://developers.facebook.com/roadmap/offline-access-removal/
Extending Access Tokens - Facebook 開發人員
http://developers.facebook.com/docs/howtos/login/extending-tokens/