directions using heroku for hosting:

create twitter app at http://twitter.com/apps
for callback url use http://<appname>.heroku.com/auth
note consumer key and consumer secret

heroku create <appname>
heroku config:add consumer_key=<consumer key from twitter> consumer_secret=<consume secret from twitter>
git push heroku master

inspired by
http://github.com/filiptepper/sinatra-oauth-1.0a-example
http://github.com/moomerman/sinitter