use the twitter stream hubot script

I just enabled the twitter stream hubot script that is already in the catalog.  I had to add a dependency for twit.

When you goto setup the environment variables for this, I think you should be able to do this to share the other twitter variables, you'll just have to add the name of the app

heroku config:set HUBOT_TWITTER_STREAM_CONSUMER_KEY=${HUBOT_TWITTER_CONSUMER_KEY} --app
heroku config:set HUBOT_TWITTER_STREAM_CONSUMER_SECRET=${HUBOT_TWITTER_CONSUMER_SECRET} --app
heroku config:set HUBOT_TWITTER_STREAM_ACCESS_TOKEN=${HUBOT_TWITTER_ACCESS_TOKEN_KEY} --app
heroku config:set HUBOT_TWITTER_ACCESS_TOKEN_SECRET=${HUBOT_TWITTER_ACCESS_TOKEN_SECRET} --app