updated twitter module to support image uploads

I have updated the twitter module to upload the thumbnail of the image with the tweet so that it shows up in the users twitter stream, rather than having to click on the link to open the gallery. This consists of the following updates:
1. changed the twitteroauth library to use the fork by natefanaro/twitteroauth supports media uploads
2. change to the controller to find the thumbnail and use the new upload method