Update GetDirectMessages to API 1.1

https://dev.twitter.com/docs/api/1.1/get/direct_messages
Update GetSentDirectMessages to API 1.1

https://dev.twitter.com/docs/api/1.1/get/direct_messages/sent
Update PostDirectMessage to API 1.1

https://dev.twitter.com/docs/api/1.1/post/direct_messages/new
Update DestroyDirectMessage to API 1.1

https://dev.twitter.com/docs/api/1.1/post/direct_messages/destroy