Fix for latest Twitter API and Hubot Version

Hey there, I think this merge will fix issue #12 and some other problems people have been having with the adapter as of late.  Twitter deprecated its 1.0 API, so sending messages was busted.  I updated the oauth requirements, added the status_id of the original messages to the in_reply_to_status_id header on the reply so it would appear as a conversation on Twitter.


Anyways, I hope this helps someone build a twitter bot someday.  Let me know if you find any bugs.