Herokuify this app

- Foreman
- Postgresql
- Unicorn
- S3 for uploads
- Call Rails.configuration.database_configuration to retrieve the adapter settings
The "view as map" feature shows a map on the company index/show pages
Update readme
Add honeybadger for logging exceptions
Add newrelic_rpm for monitoring
Cache site#index
Update list of omniauth providers
Update settings.yml