Add continuous deployment to Heroku

http://about.travis-ci.org/blog/2013-07-09-introducing-continuous-deployment-to-heroku/

.travis.yml

@@ -1,6 +1,14 @@
+---
 before_install: gem install bundler --pre
 before_script: bundle exec rake db:create db:schema:load
 bundler_args: --without assets:development:production
 language: ruby
 rvm:
-  - 1.9.3
+- 1.9.3
+deploy:
+  api_key:
+    secure: "q1sCaofDYIfYNgiqTjR1awMsfmy3mleYRPzLvksJMfQF3iY3mfntXu98exuv1vHK+qoQWyXLhLjhRhpfxVJ+QULltvFavrhv35WEDzGRnDDn2saVaOhOFaJ+Izgq3Dw8vFrN7Y6zhGkMa7QY48D+Ux29kvQ4j7TV3A8lijsusOk="
+  on:
+    rvm: 1.9.3
+  provider: heroku
+  run: "rake db:migrate"