Update to non yanked twitter

Depends on / Includes  #27

The cucumber tests caught some changes in the twitter gem's API but seem to have a bit of code rot that needs investigation.

I updated the the vcr fixture (and removed private info :)

Additionally, the `app/models/hug_app_code.rb` seems to me it should be in `app/models/tweet.rb`

Note that retweeting found tweets now requires setting the retweet: true environmental variable in the application.yml