Use ruby 2.1.1.
Use unicorn as production app server.
Add in rails 4 /bin.
Update groupdate to see if it fixes the heroku deploy.
Switch to pg for data store.
Update travis to use updated ruby version.
Switch travis to postgres too.
Add travis ci database-specific config since it differs from local test.
Merge pull request #23 from winterchord/move_to_heroku_17

Move production deployment to heroku.